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Novikov self-consistency principle

The Novikov self-consistency principle, also known as the Novikov self-consistency conjecture and Larry Niven's law of conservation of history, is a principle developed by Russian physicist Igor Dmitriyevich Novikov in the mid-1980s. Novikov intended it to solve the problem of paradoxes in time travel, which is theoretically permitted in certain solutions of general relativity that contain what are known as closed timelike curves. The principle asserts that if an event exists that would cause a paradox or any "change" to the past whatsoever, then the probability of that event is zero. It would thus be impossible to create time paradoxes.

History
Physicists have long known that some solutions to the theory of general relativity contain closed timelike curves—for example the Gödel metric. Novikov discussed the possibility of closed timelike curves (CTCs) in books he wrote in 1975 and 1983, offering the opinion that only self-consistent trips back in time would be permitted. In a 1990 paper by Novikov and several others, "Cauchy problem in spacetimes with closed timelike curves", the authors state:

"The only type of causality violation that the authors would find unacceptable is that embodied in the science-fiction concept of going backward in time and killing one's younger self ("changing the past"). Some years ago one of us (Novikov) briefly considered the possibility that CTCs might exist and argued that they cannot entail this type of causality violation: events on a CTC are already guaranteed to be self-consistent, Novikov argued; they influence each other around a closed curve in a self-adjusted, cyclical, self-consistent way. The other authors recently have arrived at the same viewpoint.

We shall embody this viewpoint in a principle of self-consistency, which states that the only solutions to the laws of physics that can occur locally in the real Universe are those which are globally self-consistent. This principle allows one to build a local solution to the equations of physics only if that local solution can be extended to a part of a (not necessarily unique) global solution, which is well defined throughout the nonsingular regions of the space-time."

Among the co-authors of this 1990 paper were Kip Thorne, Mike Morris, and Ulvi Yurtsever, who in 1988 had stirred up renewed interest in the subject of time travel in general relativity with their paper "Wormholes, Time Machines, and the Weak Energy Condition", which showed that a new general relativity solution known as a traversable wormhole could lead to closed timelike curves, and unlike previous CTC-containing solutions, it did not require unrealistic conditions for the universe as a whole. After discussions with the lead author of the 1990 paper, John Friedman, they convinced themselves that time travel need not lead to unresolvable paradoxes, regardless of the object sent through the wormhole.

By way of response, physicist Joseph Polchinski wrote them a letter arguing that one could avoid the issue of free will by employing a potentially paradoxical thought experiment involving a billiard ball sent back in time through a wormhole. In Polchinski's scenario, the billiard ball is fired into the wormhole at an angle such that, if it continues along its path, it will exit in the past at just the right angle to collide with its earlier self, knocking it off track and preventing it from entering the wormhole in the first place. Thorne would refer to this scenario as "Polchinski's paradox" in 1994.

Upon considering the scenario, Fernando Echeverria and Gunnar Klinkhammer, two students at Caltech (where Thorne taught), arrived at a solution to the problem, that lays out the same elements as the solution Feynman and Wheeler termed the "glancing blow" solution, to evade inconsistencies arising from causality loops. In the revised scenario, the ball from the future emerges at a different angle than the one that generates the paradox, and delivers its younger self a glancing blow instead of knocking it completely away from the wormhole. This blow alters its trajectory by just the right degree, meaning it will travel back in time with the angle required to deliver its younger self the necessary glancing blow. Echeverria and Klinkhammer actually found that there was more than one self-consistent solution, with slightly different angles for the glancing blow in each situation. Later analysis by Thorne and Robert Forward illustrated that for certain initial trajectories of the billiard ball, there could actually be an infinite number of self-consistent solutions.

Echeverria, Klinkhammer, and Thorne published a paper discussing these results in 1991; in addition, they reported that they had tried to see if they could find any initial conditions for the billiard ball for which there were no self-consistent extensions, but were unable to do so. Thus, it is plausible that there exist self-consistent extensions for every possible initial trajectory, although this has not been proven. This only applies to initial conditions outside of the chronology-violating region of spacetime, which is bounded by a Cauchy horizon. This could mean that the Novikov self-consistency principle does not actually place any constraints on systems outside of the region of space-time where time travel is possible, only inside it.

Even if self-consistent extensions can be found for arbitrary initial conditions outside the Cauchy horizon, the finding that there can be multiple distinct self-consistent extensions for the same initial condition—indeed, Echeverria et al. found an infinite number of consistent extensions for every initial trajectory they analyzed —can be seen as problematic, since classically there seems to be no way to decide which extension the laws of physics will choose. To get around this difficulty, Thorne and Klinkhammer analyzed the billiard ball scenario using quantum mechanics, performing a quantum-mechanical sum over histories (path integral) using only the consistent extensions, and found that this resulted in a well-defined probability for each consistent extension. The authors of "Cauchy problem in spacetimes with closed timelike curves" write:

"The simplest way to impose the principle of self-consistency in quantum mechanics (in a classical space-time) is by a sum-over-histories formulation in which one includes all those, and only those, histories that are self-consistent. It turns out that, at least formally (modulo such issues as the convergence of the sum), for every choice of the billiard ball's initial, nonrelativistic wave function before the Cauchy horizon, such a sum over histories produces unique, self-consistent probabilities for the outcomes of all sets of subsequent measurements. ... We suspect, more generally, that for any quantum system in a classical wormhole spacetime with a stable Cauchy horizon, the sum over all self-consistent histories will give unique, self-consistent probabilities for the outcomes of all sets of measurements that one might choose to make."

Assumptions
The Novikov consistency principle assumes certain conditions about what sort of time travel is possible. Specifically, it assumes either that there is only one timeline, or that any alternative timelines (such as those postulated by the many-worlds interpretation of quantum mechanics) are not accessible.

Given these assumptions, the constraint that time travel must not lead to inconsistent outcomes could be seen merely as a tautology, a self-evident truth that cannot possibly be false. However, the Novikov self-consistency principle is intended to go beyond just the statement that history must be consistent, making the additional nontrivial assumption that the universe obeys the same local laws of physics in situations involving time travel that it does in regions of space-time that lack closed timelike curves. This is clarified in the above-mentioned "Cauchy problem in spacetimes with closed timelike curves", where the authors write:

"That the principle of self-consistency is not totally tautological becomes clear when one considers the following alternative: The laws of physics might permit CTCs; and when CTCs occur, they might trigger new kinds of local physics which we have not previously met. ... The principle of self-consistency is intended to rule out such behavior. It insists that local physics is governed by the same types of physical laws as we deal with in the absence of CTCs: the laws that entail self-consistent single valuedness for the fields. In essence, the principle of self-consistency is a principle of no new physics. If one is inclined from the outset to ignore or discount the possibility of new physics, then one will regard self-consistency as a trivial principle."

Implications for time travelers
The assumptions of the self-consistency principle can be extended to hypothetical scenarios involving intelligent time travelers as well as unintelligent objects such as billiard balls. The authors of "Cauchy problem in spacetimes with closed timelike curves" commented on the issue in the paper's conclusion, writing:

"If CTCs are allowed, and if the above vision of theoretical physics' accommodation with them turns out to be more or less correct, then what will this imply about the philosophical notion of free will for humans and other intelligent beings? It certainly will imply that intelligent beings cannot change the past. Such change is incompatible with the principle of self-consistency. Consequently, any being who went through a wormhole and tried to change the past would be prevented by physical law from making the change; i.e., the "free will" of the being would be constrained. Although this constraint has a more global character than constraints on free will that follow from the standard, local laws of physics, it is not obvious to us that this constraint is more severe than those imposed by standard physical law."

Similarly, physicist and astronomer J. Craig Wheeler concludes that:

"According to the consistency conjecture, any complex interpersonal interactions must work themselves out self-consistently so that there is no paradox. That is the resolution. This means, if taken literally, that if time machines exist, there can be no free will. You cannot will yourself to kill your younger self if you travel back in time. You can coexist, take yourself out for a beer, celebrate your birthday together, but somehow circumstances will dictate that you cannot behave in a way that leads to a paradox in time. Novikov supports this point of view with another argument: physics already restricts your free will every day. You may will yourself to fly or to walk through a concrete wall, but gravity and condensed-matter physics dictate that you cannot. Why, Novikov asks, is the consistency restriction placed on a time traveler any different?"

Time-loop logic
Time-loop logic, coined by roboticist and futurist Hans Moravec, is a hypothetical system of computation that exploits the Novikov self-consistency principle to compute answers much faster than possible with the standard model of computational complexity using Turing machines. In this system, a computer sends a result of a computation backwards through time and relies upon the self-consistency principle to force the sent result to be correct, provided the machine can reliably receive information from the future and provided the algorithm and the underlying mechanism are formally correct. An incorrect result or no result can still be produced if the time travel mechanism or algorithm are not guaranteed to be accurate.

A simple example is an iterative method algorithm. Moravec states:

"Make a computing box that accepts an input, which represents an approximate solution to some problem, and produces an output that is an improved approximation. Conventionally you would apply such a computation repeatedly a finite number of times, and then settle for the better, but still approximate, result. Given an appropriate negative delay something else is possible: [...] the result of each iteration of the function is brought back in time to serve as the "first" approximation. As soon as the machine is activated, a so-called "fixed-point" of F, an input which produces an identical output, usually signaling a perfect answer, appears (by an extraordinary coincidence!) immediately and steadily. [...] If the iteration does not converge, that is, if F has no fixed point, the computer outputs and inputs will shut down or hover in an unlikely intermediate state."

Quantum computation with a negative delay
Physicist David Deutsch showed in 1991 that this model of computation could solve NP problems in polynomial time, and Scott Aaronson later extended this result to show that the model could also be used to solve PSPACE problems in polynomial time. Deutsch shows that quantum computation with a negative delay—backwards time travel—produces only self-consistent solutions, and the chronology-violating region imposes constraints that are not apparent through classical reasoning. Researchers published in 2014 a simulation in which they claim to have validated Deutsch's model with photons. However, it was shown in an article by Tolksdorf and Verch that Deutsch's self-consistency condition can be fulfilled to arbitrary precision in any quantum system described according to relativistic quantum field theory even on spacetimes which do not admit closed timelike curves, casting doubts on whether Deutsch's model is really characteristic of quantum processes simulating closed timelike curves in the sense of general relativity. In a later article, the same authors show that Deutsch's CTC fixed point condition can also be fulfilled in any system subject to the laws of classical statistical mechanics, even if it is not built up by quantum systems. The authors conclude that hence, Deutsch's condition is not specific to quantum physics, nor does it depend on the quantum nature of a physical system so that it can be fulfilled. In consequence, Tolksdorf and Verch argue that Deutsch's condition is not sufficiently specific to allow statements about time travel scenarios or their hypothetical realization by quantum physics.

Lloyd's prescription
An alternative proposal was later presented by Seth Lloyd based upon post-selection and path integrals. In particular, the path integral is over single-valued fields, leading to self-consistent histories.

In popular culture

 * The Final Countdown (1980): A science-fiction time-travel movie in which the aircraft carrier USS Nimitz passes through a wormhole back to the eve of the Japanese attack on Pearl Harbor. The anomaly returns and sends it back into the present, before it has a chance to affect the outcome.
 * The story The Merchant and the Alchemist's Gate (2007) by Ted Chiang explores the interplay between free will and self-consistent time-travel.
 * Steins;Gate (2009): Cited by Makise Kurisu during her presentation on time travel.
 * Harry Potter and the Methods of Rationality: In Eliezer Yudkowsky's exposition on rationality, framed as a piece of Harry Potter fanfiction, Harry attempts to use his Time Turner to influence the past and comes to the conclusion that the Novikov self-consistency principle applies.
 * Orthogonal: A science-fiction novel series by Greg Egan that applies the principle.
 * The Netflix series Dark is largely based on the notion that the possibility of time travel tempts the characters to try change the past, which only leads them to cause the events they were trying to prevent in the first place.
 * Quantum Break (2016): A video game by Remedy Entertainment, centers heavily on the question whether the past can be changed or not. Some of the characters in the plot are driven to change it, whereas others, who have already tried doing so in vain, have resigned themselves to come to the conclusion that the Novikov self-consistency principle seemingly applies.
 * Outer Wilds (2019): A video game involving time travel which does not follow the principle, causing a game over if the player experiments to test it.
 * All time travel in the Hallmark Channel original series The Way Home follows the Novikov self-consistency principle. Two of the main characters can travel backwards in time by jumping into a pond, but they are unable to change anything in the past. All of their actions become part of history, and they actually end up causing the tragic events they were trying to prevent in the first place.

title: Novikov self-consistency principle


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Colossus

Colossus, Colossos, or the plural Colossi or Colossuses, may refer to:

Statues

 * Any exceptionally large statue
 * List of tallest statues
 * Category:Colossal statues
 * Apennine Colossus, a stone statue created as a personification of the Apennine mountains
 * Colossus of Barletta, a bronze statue of an unidentified Roman emperor
 * Colossus of Constantine, a bronze and marble statue of the Roman emperor Constantine the Great
 * Colossi of Memnon, two stone statues of Pharaoh Amenhotep III
 * Colossus of Nero, a bronze statue of the Roman emperor Nero
 * Colossus of Ramesses II
 * Colossus of Rhodes, a bronze statue of the Greek god Helios

Amusement rides

 * Colossus (Ferris wheel), Ferris wheel at Six Flags St. Louis, Missouri, US
 * Colossus, a pirate ship at Robin Hill theme park, Isle of Wight, UK

Roller coasters

 * Colossos (Heide Park), in Lower Saxony, Germany
 * Colossus (Six Flags Magic Mountain), in California, US
 * Colossus (Thorpe Park), in Surrey, UK
 * Colossus the Fire Dragon, at Lagoon amusement park, Utah, US

Fictional entities

 * Colossus (comics), a fictional character in the X-Men series
 * Colossi, the eponymous enemies in Shadow of the Colossus
 * GTVA Colossus, a spacefaring warship in FreeSpace 2

Film

 * Colossus: The Forbin Project (1970), a film based on the D. F. Jones novel

Games

 * Colossus Chess, a series of chess-playing programs

Literature

 * Colossus (collection), short stories by Donald Wandrei
 * Colossus, a fictional computer that features in the novel Colossus, by D. F. Jones, its sequels, and film adaptation

Music

 * Colossus Records, an American label
 * Colossus (band), an American Christian metal band from Sioux Falls, South Dakota

Albums

 * Colossus (Scorn album), 1993
 * Colossus (Walt Mink album), 1997
 * Colossus, by Triggerfinger, 2017
 * Colossus (EP), by Caligula's Horse, 2011

Songs

 * "Colossus", by Afro Celt Sound System from Volume 3: Further in Time
 * "Colossus", by Borknagar from Quintessence
 * "Colossus", by Caligula's Horse from Colossus
 * "Colossus", by Idles from Joy as an Act of Resistance
 * "Colossus", by In Mourning from The Weight of Oceans
 * "Colossus", by Jinjer from Wallflowers
 * "Colossus", by Lightning Bolt from Earthly Delights
 * "Colossus", by Omega Lithium from Kinetik
 * "Colossus", by Thomas Bangalter from Trax On Da Rocks Vol.2
 * "Colossus", by Tyler, the Creator from Wolf

Computing

 * Colossus computer, the first programmable electronic digital computer, used for code breaking in World War II
 * Colossus, the codename for a new version of the Google File System
 * COLOSSUS, the software program controlling the Apollo Guidance Computer in the command module of the Apollo missions

Warships

 * Colossus class (disambiguation) (UK)
 * French ship Colosse
 * HMS Colossus (UK)
 * USS Colossus (US)

Other uses

 * Colossus Cinemas, a Canadian movie theater brand
 * Colossus, a reticulated python once considered the largest snake in captivity

license: Creative Commons - Attribution Share-Alike - https://creativecommons.org/licenses/by-sa/4.0/

title: Colossus


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Pope Leo VIII

Pope Leo VIII (c. 915 – 1 March 965) was a Roman prelate who claimed the Holy See from 963 until 964 in opposition to John XII and Benedict V and again from 23 June 964 to his death. Today, he is considered by the Catholic Church to have been an antipope during the first period and the legitimate Pope during the second. An appointee of Holy Roman Emperor Otto I, Leo VIII's pontificate occurred after the period known as the saeculum obscurum.

Early life
Born in Rome in the region around the Clivus Argentarius, Leo came from an illustrious noble family. He was the son of John, who held the office of protonotary. Although a layperson, he was the protoscriniarius (or superintendent of the Roman public schools for scribes) in the papal court during the pontificate of John XII. In 963, he was included in a party that John sent to the newly crowned Holy Roman emperor, Otto I, who was besieging the deposed King Berengar II of Italy at the castle of St. Leo in Umbria. His instructions were to reassure the emperor that the pope was determined to correct the abuses of the papal court, as well as protest Otto's actions in demanding that cities in the Papal States take an oath of fidelity to the emperor instead of the pope.

Struggle for papacy
By the time Otto entered Rome to depose Pope John XII, Leo had been appointed protonotary to the Apostolic See. A synod convened by the emperor uncanonically deposed John XII (who had fled to Tibur). It proceeded to elect Leo VIII, who was the emperor's nominee, as pope on 4 December 963. Since Leo was still a layman, he was ordained as ostiarius, lector, acolyte, subdeacon, deacon and priest in the space of a day by Sico, the cardinal-bishop of Ostia, who then proceeded to consecrate him as bishop on 6 December 963. The deposed John, however, still had a large body of sympathisers within Rome; he offered large bribes to the Roman nobility if they would rise up and overthrow Otto and kill Leo, and so, in early January 964, the Roman people staged an uprising that was quickly put down by Otto's troops. Leo, hoping to reach out to the Roman nobility, persuaded Otto to release the hostages he had taken from the leading Roman families in exchange for their continued good behaviour. However, once Otto left Rome around 12 January 964, the Romans again rebelled, and caused Leo to flee Rome and take refuge with Otto sometime in February 964.

John XII returned, and in February convened a synod which in turn deposed Leo on 26 February 964, with John excommunicating Leo in the process. Leo remained with Otto, and, with the death of John XII in May 964, the Romans elected Benedict V. Otto proceeded to besiege Rome, taking Leo with him, and when the Romans eventually surrendered to Otto, Leo was reinstalled in the Lateran Palace as Pope.

The former pope was brought before Leo with Benedict's clerical and lay supporters and clad in his pontifical robes. Benedict was asked how he dared to assume the chair of Saint Peter while Leo was still alive. Benedict responded, "If I have sinned, have mercy on me." Having received a promise from the emperor that his life would be spared if he submitted, Benedict threw himself at Leo's feet and acknowledged his guilt. Brought before a synod convened by Leo, Benedict's episcopal ordination was revoked, his pallium was torn from him, and his pastoral staff was broken over him by Leo. However, through the intercession of Otto, Benedict was allowed to retain the rank of deacon. Then, after having the Roman nobility swear an oath over the Tomb of Saint Peter to obey and be faithful to Leo, Otto departed Rome in late June 964.

Pontificate
Having been crowned by Otto, the remainder of Leo's pontificate was reasonably trouble-free. He issued numerous bulls, many of which detailed granting privileges to Otto and his successors. Some of the bulls were alleged to grant the Holy Roman emperors the right to choose their successors in the Kingdom of Italy and the right to nominate the pope, and all popes, archbishops, and bishops were to receive investiture from the emperor. In addition, Leo is also claimed to have relinquished to Otto all the territory of the Papal States that had been granted to the Apostolic See by Pepin the Short and Charlemagne. Although Leo certainly granted various concessions to his imperial patron, it is now believed that the "investiture" bulls associated with Leo were, if not completely fabricated during the Investiture Controversy, at the very least so tampered with that it is now largely impossible to reconstruct them in their original form.

Leo VIII died on 1 March 965 and was succeeded by John XIII. The Liber Pontificalis described him as venerable, energetic, and honourable. He had some streets dedicated to him in and around the Clivus Argentarius, including the descensus Leonis Prothi.

Historiography
Although Leo was considered an antipope for many years, his current status is still confusing. The Annuario Pontificio makes the following point about the pontificate of Leo VIII: "'At this point, as again in the mid-eleventh century, we come across elections in which problems of harmonizing historical criteria and those of theology and canon law make it impossible to decide clearly which side possessed the legitimacy whose factual existence guarantees the unbroken lawful succession of the Successors of Saint Peter. The uncertainty that in some cases results has made it advisable to abandon the assignation of successive numbers in the list of the Popes.'"

Due to Leo's uncanonical original election, it is now accepted that, at least until the deposition of Benedict V, he was almost certainly an antipope. The deposition of John XII was almost certainly invalid, as John did not acquiesce, so the election of Benedict V almost certainly was canonical. However, if Benedict did consent to his deposition as Liutprand of Cremona (who chronicled the events of this period) wrote, and if, as seems certain, no further protest was made against Leo's position, it has been the consensus of historians that he may be regarded as a true pope from July 964 to his death in 965. The fact that no one else attempted to claim the papacy during this time and that the next pope to assume the name Leo was consecrated Leo IX also seems to indicate that he is a true pope.

title: Pope Leo VIII


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Vagus nerve

The vagus nerve, also known as the tenth cranial nerve, cranial nerve X, or simply CN X, is a cranial nerve that carries sensory fibers that create a pathway that interfaces with the parasympathetic control of the heart, lungs, and digestive tract. It comprises two nerves—the left and right vagus nerves, each containing about 100,000 fibres—but they are typically referred to collectively as a single subsystem.

The vagus is the longest nerve of the autonomic nervous system in the human body and comprises both sensory and motor fibers. The sensory fibers originate from neurons of the nodose ganglion, whereas the motor fibers come from neurons of the dorsal motor nucleus of the vagus and the nucleus ambiguus. The vagus was also historically called the pneumogastric nerve.

Structure
Upon leaving the medulla oblongata between the olive and the inferior cerebellar peduncle, the vagus nerve extends through the jugular foramen, then passes into the carotid sheath between the internal carotid artery and the internal jugular vein down to the neck, chest, and abdomen, where it contributes to the innervation of the viscera, reaching all the way to the colon. Besides giving some output to various organs, the vagus nerve comprises between 80% and 90% of afferent nerves mostly conveying sensory information about the state of the body's organs to the central nervous system.

The right and left vagus nerves descend from the cranial vault through the jugular foramina, penetrating the carotid sheath between the internal and external carotid arteries, then passing posterolateral to the common carotid artery. The cell bodies of visceral afferent fibers of the vagus nerve are located bilaterally in the inferior ganglion of the vagus nerve (nodose ganglia).

The vagus runs parallel to the common carotid artery and internal jugular vein inside the carotid sheath.

The right vagus nerve gives rise to the right recurrent laryngeal nerve, which hooks around the right subclavian artery and ascends into the neck between the trachea and esophagus. The right vagus then crosses anterior to the right subclavian artery, runs posterior to the superior vena cava, descends posterior to the right main bronchus, and contributes to cardiac, pulmonary, and esophageal plexuses. It forms the posterior vagal trunk at the lower part of the esophagus and enters the diaphragm through the esophageal hiatus.

The left vagus nerve enters the thorax between left common carotid artery and left subclavian artery and descends on the aortic arch. It gives rise to the left recurrent laryngeal nerve, which hooks around the aortic arch to the left of the ligamentum arteriosum and ascends between the trachea and esophagus. The left vagus further gives off thoracic cardiac branches, breaks up into the pulmonary plexus, continues into the esophageal plexus, and enters the abdomen as the anterior vagal trunk in the esophageal hiatus of the diaphragm.

Branches

 * Pharyngeal nerve
 * Superior laryngeal nerve
 * Aortic nerve
 * Superior cervical cardiac branches of vagus nerve
 * Inferior cervical cardiac branch
 * Recurrent laryngeal nerve
 * Thoracic cardiac branches
 * Branches to the pulmonary plexus
 * Branches to the esophageal plexus
 * Anterior vagal trunk
 * Posterior vagal trunk

Nuclei
The vagus nerve includes axons which emerge from or converge onto four nuclei of the medulla:
 * 1) The dorsal nucleus of vagus nerve  – which sends parasympathetic output to the viscera, especially the intestines
 * 2) The nucleus ambiguus – which gives rise to the branchial efferent motor fibers of the vagus nerve and preganglionic parasympathetic neurons that innervate the heart
 * 3) The solitary nucleus – which receives afferent taste information and primary afferents from visceral organs
 * 4) The spinal trigeminal nucleus – which receives information about deep/crude touch, pain, and temperature of the outer ear, the dura of the posterior cranial fossa and the mucosa of the larynx

Development
The motor division of the glossopharyngeal nerve is derived from the basal plate of the embryonic medulla oblongata, while the sensory division originates from the cranial neural crest.

Function
The vagus nerve supplies motor parasympathetic fibers to all the organs (except the adrenal glands) from the neck down to the second segment of the transverse colon. The vagus also controls a few skeletal muscles, including:
 * Cricothyroid muscle
 * Levator veli palatini muscle
 * Salpingopharyngeus muscle
 * Palatoglossus muscle
 * Palatopharyngeus muscle
 * Superior, middle and inferior pharyngeal constrictors
 * Muscles of the larynx (speech).

This means that the vagus nerve is responsible for such varied tasks as heart rate, gastrointestinal peristalsis, sweating, and quite a few muscle movements in the mouth, including speech (via the recurrent laryngeal nerve). It also has some afferent fibers that innervate the inner (canal) portion of the outer ear (via the auricular branch, also known as Arnold's or Alderman's nerve) and part of the meninges. The vagus nerve is also responsible for regulating inflammation in the body, via the inflammatory reflex.

Efferent vagus nerve fibers innervating the pharynx and back of the throat are responsible for the gag reflex. In addition, 5-HT3 receptor-mediated afferent vagus stimulation in the gut due to gastroenteritis is a cause of vomiting. Stimulation of the vagus nerve in the cervix uteri (as in some medical procedures) can lead to a vasovagal response.

The vagus nerve also plays a role in satiation following food consumption. Knocking out vagal nerve receptors has been shown to cause hyperphagia (greatly increased food intake). Neuroscientist Ivan De Araujo and colleagues have shown that the vagus nerve transmits reward signals from the body to the brain, potentially explaining how stimulation of the nerve leads to emotional changes.

Cardiac effects

Parasympathetic innervation of the heart is partially controlled by the vagus nerve and is shared by the thoracic ganglia. Vagal and spinal ganglionic nerves mediate the lowering of the heart rate. The right vagus branch innervates the sinoatrial node. In healthy people, parasympathetic tone from these sources is well-matched to sympathetic tone. Hyperstimulation of parasympathetic influence promotes bradyarrhythmias. When hyperstimulated, the left vagal branch predisposes the heart to conduction block at the atrioventricular node.

At this location, neuroscientist Otto Loewi first demonstrated that nerves secrete substances called neurotransmitters, which have effects on receptors in target tissues. In his experiment, Loewi electrically stimulated the vagus nerve of a frog heart, which slowed the heart. Then he took the fluid from the heart and transferred it to a second frog heart without a vagus nerve. The second heart slowed without electrical stimulation. Loewi described the substance released by the vagus nerve as vagusstoff, which was later found to be acetylcholine.

Drugs that inhibit the muscarinic receptors (anticholinergics) such as atropine and scopolamine, are called vagolytic because they inhibit the action of the vagus nerve on the heart, gastrointestinal tract, and other organs. Anticholinergic drugs increase heart rate and are used to treat bradycardia.

Urogenital and hormonal effects
Excessive activation of the vagal nerve during emotional stress, which is a parasympathetic overcompensation for a strong sympathetic nervous system response associated with stress, can also cause vasovagal syncope due to a sudden drop in cardiac output, causing cerebral hypoperfusion. Vasovagal syncope affects young children and women more than other groups. It can also lead to temporary loss of bladder control under moments of extreme fear.

Research has shown that women having had complete spinal cord injury can experience orgasms through the vagus nerve, which can go from the uterus and cervix to the brain.

Insulin signaling activates the adenosine triphosphate (ATP)-sensitive potassium (KATP) channels in the arcuate nucleus, decreases AgRP release, and through the vagus nerve, leads to decreased glucose production by the liver by decreasing gluconeogenic enzymes: phosphoenolpyruvate carboxykinase, glucose 6-phosphatase.

Stimulation
Vagus nerve stimulation (VNS) therapy via a neurostimulator implanted in the chest has been used to control seizures in epilepsy patients and has been approved for treating drug-resistant clinical depression. Several noninvasive VNS devices that stimulate an afferent branch of the vagus nerve are available. GammaCore is recommended by The National Institute for Health and Care Excellence (NICE) for cluster headaches.

VNS may also be achieved by one of the vagal maneuvers: holding the breath for 20 to 60 seconds, dipping the face in cold water, coughing, humming or singing, or tensing the stomach muscles as if to bear down to have a bowel movement. Patients with supraventricular tachycardia, atrial fibrillation, and other illnesses may be trained to perform vagal maneuvers (or find one or more on their own).

Vagus nerve blocking (VBLOC) therapy is similar to VNS but used only during the day. In a six-month open-label trial involving three medical centers in Australia, Mexico, and Norway, vagus nerve blocking helped 31 obese participants lose an average of nearly 15 percent of their excess weight. , a yearlong double-blind, phase II trial had begun.

Vagotomy
Vagotomy (cutting of the vagus nerve) is a now obsolete therapy that was performed for peptic ulcer disease and now superseded by oral medications, including H2 antagonists, proton pump inhibitors and antibiotics. Vagotomy is currently being researched as a less invasive alternative weight-loss procedure to gastric bypass surgery. The procedure curbs the feeling of hunger and is sometimes performed in conjunction with putting bands on patients' stomachs, resulting in an average of 43% of excess weight loss at six months with diet and exercise.

One serious side effect of vagotomy is a vitamin B12 deficiency later in life – perhaps after about 10 years – that is similar to pernicious anemia. The vagus normally stimulates the stomach's parietal cells to secrete acid and intrinsic factor. Intrinsic factor is needed to absorb vitamin B12 from food. The vagotomy reduces this secretion and ultimately leads to deficiency, which, if left untreated, causes nerve damage, tiredness, dementia, paranoia, and ultimately death.

Researchers from Aarhus University and Aarhus University Hospital have demonstrated that vagotomy prevents (halves the risk of) the development of Parkinson's disease, suggesting that Parkinson's disease begins in the gastrointestinal tract and spreads via the vagus nerve to the brain. Or giving further evidence to the theory that dysregulated environmental stimuli, such as that received by the vagus nerve from the gut, may have a negative effect on the dopamine reward system of the substantia nigra, thereby causing Parkinson's disease.

Vagus nerve pathology
The sympathetic and parasympathetic components of the autonomic nervous system (ANS) control and regulate the function of various organs, glands, and involuntary muscles throughout the body (e.g., vocalization, swallowing, heart rate, respiration, gastric secretion, and intestinal motility). Hence, most of the signs and symptoms of vagus nerve dysfunction, apart from vocalisation, are vague and non specific. Laryngeal nerve palsy results in paralysis of an ipsilateral vocal cord and is used as a pointer to diseases affecting the vagus nerve from its origin down to termination of its branch of the laryngeal nerve.

 * Sensory neuropathy

The hypersensitivity of vagal afferent nerves causes refractory or idiopathic cough.

Arnold's nerve ear-cough reflex, though uncommon, is a manifestation of a vagal sensory neuropathy and this is the cause of a refractory chronic cough that can be treated with gabapentin. The cough is triggered by mechanical stimulation of the external auditory meatus and accompanied by other neuropathic features such as throat irritation (laryngeal paresthesia) and cough triggered by exposure to nontussive triggers such as cold air and eating (termed allotussia). These features suggest a neuropathic origin to the cough.

 * Motor neuropathy

Pathology of the vagus nerve proximal to the laryngeal nerve typically presents with symptom hoarse voice and physical sign of paralysed vocal cords. Although a large proportion of these are the result of idiopathic vocal cord palsy but tumours especially lung cancers are next common cause. Tumours at the apex of right lung and at the hilum of the left lung are the most common oncological causes of vocal cord palsy. Less common tumours causing vocal cord palsy includes thyroid and proximal oesophageal malignancy.

Cluster headaches
NICE in the UK recommend VNS for cluster headaches.

Etymology
The Latin word vagus means literally "wandering" (the words vagrant, vagabond, vague, and divagation come from the same root). Sometimes the right and left branches together are spoken of in the plural and are thus called vagi. The vagus was also historically called the pneumogastric nerve since it innervates both the lungs and the stomach.

title: Vagus nerve


text:
Talk:Openlaw

Copyleft?
Is the Design Science License ( which this article is released under, see ) compatible with the GFDL? -- 213.66.62.xxx

 * I contacted the author, Graham Lawton, with a link to this page and his email suggested that it was ok - "Good." Having written about Wikipedia in the article presumably he knows the implications of the license. (Comment made by 62.252.160.xxx 16:51, February 25, 2002. Attributed by Ben T/C 17:07, 6 December 2006 (UTC))

 * I couldn't locate the copyleft information that the link in the article referred to. Ben T/C 17:07, 6 December 2006 (UTC)

title: Talk:Openlaw


text:
Thomas Becket

Thomas Becket, also known as Saint Thomas of Canterbury, Thomas of London and later Thomas à Becket (21 December 1119 or 1120 – 29 December 1170), served as Lord Chancellor from 1155 to 1162, and then notably as Archbishop of Canterbury from 1162 until his death in 1170. He engaged in conflict with Henry II, King of England, over the rights and privileges of the Church and was murdered by followers of the King in Canterbury Cathedral. Soon after his death, he was canonised by Pope Alexander III. He is venerated as a saint and martyr by the Catholic Church and the Anglican Communion.

Early life
Becket was born c. 1119, or in 1120 according to later tradition, at Cheapside, London, on 21 December, the feast day of St Thomas the Apostle. He was the son of Gilbert and Matilda Beket. Gilbert's father was from Thierville in the lordship of Brionne in Normandy, and was either a small landowner or a petty knight. Matilda was also of Norman descent – her family may have originated near Caen. Gilbert was perhaps related to Theobald of Bec, whose family was also from Thierville. Gilbert began his life as a merchant, perhaps in textiles, but by the 1120s he was living in London and was a property owner, living on the rental income from his properties. He also served as the sheriff of the city at some point. Becket's parents were buried in Old St Paul's Cathedral.

One of Becket's father's wealthy friends, Richer de L'Aigle, often invited Thomas to his estates in Sussex, where Becket encountered hunting and hawking. According to Grim, Becket learned much from Richer, who was later a signatory of the Constitutions of Clarendon against him.

At the age of 10, Becket was sent as a student to Merton Priory south-west of the city in Surrey. He later attended a grammar school in London, perhaps the one at St Paul's Cathedral. He did not study any subjects beyond the trivium and quadrivium at these schools. Around the age of 20, he spent about a year in Paris, but he did not study canon or civil law at the time and his Latin skill always remained somewhat rudimentary. Some time after Becket began his schooling, Gilbert Becket suffered financial reverses and the younger Becket was forced to earn a living as a clerk. Gilbert first secured a place for his son in the business of a relative – Osbert Huitdeniers. Later Becket acquired a position in the household of Theobald of Bec, by then Archbishop of Canterbury.

Theobald entrusted him with several important missions to Rome and also sent him to Bologna and Auxerre to study canon law. In 1154, Theobald named Becket Archdeacon of Canterbury, and other ecclesiastical offices included a number of benefices, prebends at Lincoln Cathedral and St Paul's Cathedral, and the office of Provost of Beverley. His efficiency in those posts led Theobald to recommend him to King Henry II for the vacant post of Lord Chancellor, to which Becket was appointed in January 1155.

As Chancellor, Becket enforced the king's traditional sources of revenue that were exacted from all landowners, including churches and bishoprics. King Henry sent his son Henry to live in Becket's household, it being the custom then for noble children to be fostered out to other noble houses.

Primacy
Becket was nominated as Archbishop of Canterbury in 1162, several months after the death of Theobald. His election was confirmed on 23 May 1162 by a royal council of bishops and noblemen. Henry may have hoped that Becket would continue to put royal government first, rather than the church, but the famed transformation of Becket into an ascetic occurred at this time.

Becket was ordained a priest on 2 June 1162 at Canterbury, and on 3 June 1162 was consecrated as archbishop by Henry of Blois, the Bishop of Winchester and the other suffragan bishops of Canterbury.

A rift grew between Henry and Becket as the new archbishop resigned his chancellorship and sought to recover and extend the rights of the archbishopric. This led to a series of conflicts with the King, including one over the jurisdiction of secular courts over English clergymen, which accelerated antipathy between Becket and the king. Attempts by Henry to influence other bishops against Becket began in Westminster in October 1163, where the King sought approval of the traditional rights of royal government in regard to the church. This led to the Constitutions of Clarendon, where Becket was officially asked to agree to the King's rights or face political repercussions.

Constitutions of Clarendon
King Henry II presided over assemblies of most of the higher English clergy at Clarendon Palace on 30 January 1164. In 16 constitutions he sought less clerical independence and weaker connections with Rome. He used his skills to induce their consent and apparently succeeded with all but Becket. Finally, even Becket expressed willingness to agree to the substance of the Constitutions of Clarendon, but he still refused formally to sign the documents. Henry summoned Becket to appear before a great council at Northampton Castle on 8 October 1164, to answer allegations of contempt of royal authority and malfeasance in the Chancellor's office. Convicted on the charges, Becket stormed out of the trial and fled to the Continent.

Henry pursued the fugitive archbishop with a series of edicts, targeting Becket and all Becket's friends and supporters, but King Louis VII of France offered Becket protection. He spent nearly two years in the Cistercian abbey of Pontigny, until Henry's threats against the order obliged him to return to Sens. Becket fought back by threatening excommunication and an interdict against the king and bishops and the kingdom, but Pope Alexander III, though sympathising with him in theory, favoured a more diplomatic approach. Papal legates were sent in 1167 with authority to act as arbitrators.

In 1170, Alexander sent delegates to impose a solution to the dispute. At that point, Henry offered a compromise that would allow Thomas to return to England from exile.

Assassination
In June 1170, Roger de Pont L'Évêque, Archbishop of York, was at York with Gilbert Foliot, Bishop of London, and Josceline de Bohon, Bishop of Salisbury, to crown the heir apparent, Henry the Young King. This breached Canterbury's privilege of coronation and in November 1170 Becket excommunicated all three.

On hearing reports of Becket's actions, Henry II is said to have uttered words interpreted by his men as wishing Becket killed. The exact wording is in doubt and several versions were reported. The most commonly quoted, as invented in 1740 and handed down by oral tradition, is "Will no one rid me of this turbulent priest?", but according to historian Simon Schama this is incorrect: he accepts the account of the contemporary biographer Edward Grim, writing in Latin, who gives, "What miserable drones and traitors have I nourished and brought up in my household, who let their lord be treated with such shameful contempt by a low-born cleric?" Many other variants have found their way into popular culture.

Regardless of what Henry said, it was interpreted as a royal command. Four knights, Reginald FitzUrse, Hugh de Morville, William de Tracy and Richard le Breton, set out to confront the Archbishop of Canterbury. On 29 December 1170, they arrived at Canterbury. According to accounts by the monk Gervase of Canterbury and eyewitness Edward Grim, the knights placed their weapons under a tree outside the cathedral and hid their armour under cloaks before entering to challenge Becket. The knights told Becket he was to go to Winchester to give an account of his actions, but Becket refused. Not until he refused their demands to submit to the king's will did they retrieve their weapons and rush back inside for the killing. Becket, meanwhile, proceeded to the main hall for vespers. The other monks tried to bolt themselves in for safety, but Becket said to them, "It is not right to make a fortress out of the house of prayer!", ordering them to reopen the doors.

The four knights, wielding drawn swords, ran into the room crying, "Where is Thomas Becket, traitor to the King and country?" They found Becket in a spot near a door to the monastic cloister, the stairs into the crypt, and the stairs leading up into the quire of the cathedral, where the monks were chanting vespers. On seeing them, Becket said, "I am no traitor and I am ready to die." One knight grabbed him and tried to pull him outside, but Becket grabbed onto a pillar and bowed his head to make peace with God.

Several contemporary accounts of what happened next exist; of particular note is that of Grim, who was wounded in the attack. This is part of his account: "...the impious knight... suddenly set upon him and [shaved] off the summit of his crown which the sacred chrism consecrated to God... Then, with another blow received on the head, he remained firm. But with the third the stricken martyr bent his knees and elbows, offering himself as a living sacrifice, saying in a low voice, 'For the name of Jesus and the protection of the church, I am ready to embrace death.' But the third knight inflicted a grave wound on the fallen one; with this blow... his crown, which was large, separated from his head so that the blood turned white from the brain yet no less did the brain turn red from the blood; it purpled the appearance of the church... The fifth – not a knight but a cleric who had entered with the knights... placed his foot on the neck of the holy priest and precious martyr and (it is horrible to say) scattered the brains with the blood across the floor, exclaiming to the rest, 'We can leave this place, knights, he will not get up again.'"

Another account appears in Expugnatio Hibernica ("Conquest of Ireland", 1189) by Gerald of Wales.

After Becket's death
After his death, the monks prepared Becket's body for burial. According to some accounts, it was found that Becket had worn a hairshirt under his archbishop's garments – a sign of penance. Soon after, the faithful throughout Europe began venerating Becket as a martyr, and on 21 February 1173 – little more than two years after his death – he was canonised by Pope Alexander III in St Peter's Church, Segni. In 1173, Becket's sister Mary was appointed Abbess of Barking as reparation for the murder of her brother. On 12 July 1174, amidst the Revolt of 1173–74, Henry humbled himself in public penance at Becket's tomb and at the church of St. Dunstan's, which became a most popular pilgrimage site.

Becket's assassins fled north to de Morville's Knaresborough Castle for about a year. De Morville also held property in Cumbria and this too may have provided a hiding place, as the men prepared for a longer stay in the separate kingdom of Scotland. They were not arrested and Henry did not confiscate their lands, but he did not help them when they sought his advice in August 1171. Pope Alexander excommunicated all four. Seeking forgiveness, the assassins travelled to Rome, where the Pope ordered them to serve as knights in the Holy Lands for a period of 14 years.

This sentence also inspired the Knights of Saint Thomas, incorporated in 1191 at Acre, and which was to be modelled on the Teutonic Knights. This was the only military order native to England (with chapters in not only Acre, but London, Kilkenny, and Nicosia), just as the Gilbertine Order was the only monastic order native to England. Henry VIII dissolved both of these during the Reformation, rather than merging them with foreign orders or nationalising them as elements of the Protestant Church of England.

The monks were afraid Becket's body might be stolen, and so his remains were placed beneath the floor of the eastern crypt of the cathedral. A stone cover over it had two holes where pilgrims could insert their heads and kiss the tomb, as illustrated in the "Miracle Windows" of the Trinity Chapel. A guard chamber (now the Wax Chamber) had a clear view of the grave. In 1220, Becket's bones were moved to a new gold-plated, bejewelled shrine behind the high altar in the Trinity Chapel. The golden casket was placed on a pink marble base with prayer niches raised on three steps. Canterbury's religious history had always brought many pilgrims, and after Becket's death the numbers rapidly rose further.

Cult in the Middle Ages

In Scotland, King William the Lion ordered the building of Arbroath Abbey in 1178. On completion in 1197 the new foundation was dedicated to Becket, whom the king had known personally while at the English court as a young man.

On 7 July 1220, the 50th jubilee year of his death, Becket's remains were moved from his first tomb to a shrine in the recently built Trinity Chapel. This translation was "one of the great symbolic events in the life of the medieval English Church", attended by King Henry III, the papal legate, the Archbishop of Canterbury Stephen Langton and many dignitaries and magnates secular and ecclesiastical. So a "major new feast day was instituted, commemorating the translation... celebrated each July almost everywhere in England and in many French churches." It was suppressed in 1536 with the Reformation.

The shrine was destroyed in 1538 during the Dissolution of the Monasteries on orders from King Henry VIII. He also destroyed Becket's bones and ordered all mention of his name obliterated.

As the scion of a mercantile dynasty of later centuries, Mercers, Becket was much regarded as a Londoner by citizens and adopted as London's co-patron saint with St Paul: both appear on the seals of the city and of the Lord Mayor. The Bridge House Estates seal has only a Becket image, while his martyrdom is shown on the reverse.

The cult included the drinking of "water of Saint Thomas", a mix of water and the remains of the martyr's blood miraculously multiplied. The procedure was frowned upon by the more orthodox, due to the similarities with the eucharist of the blood of Jesus.

Local legends regarding Becket arose after his canonisation. Though they tend towards typical hagiography, they also display Becket's well-known gruffness. "Becket's Well", in Otford, Kent, is said to have been created after Becket had been displeased by the taste of the local water. Two springs of clear water are said to have bubbled up after he struck the ground with his crozier. The absence of nightingales in Otford is also ascribed to Becket, who is said to have been so disturbed in his devotions by the song of a nightingale that he commanded that none sing in the town ever again. In the town of Strood, Kent, Becket is said to have caused the inhabitants and their descendants to be born with tails. The men of Strood had sided with the king in his struggles against the archbishop, and to demonstrate their support had cut off the tail of Becket's horse as he passed through the town.

The saint's fame quickly spread through the Norman world. The first holy image of Becket is thought to be a mosaic icon still visible in Monreale Cathedral in Sicily, created shortly after his death. Becket's cousins obtained refuge at the Sicilian court during their exile, and King William II of Sicily wed a daughter of Henry II. Marsala Cathedral in western Sicily is dedicated to Becket. Over 45 medieval chasse reliquaries decorated in champlevé enamel showing similar scenes from Becket's life survive, including the Becket Casket, constructed to hold relics of him at Peterborough Abbey and now housed in London's Victoria and Albert Museum.

Legacy

 * In 1170 King Alfonso VIII of Castille married Eleanor Plantagenet, second daughter of Henry II and Eleanor Queen of England and Duchess of Aquitaine. She honoured Becket with a wall painting of his martyrdom that survives in the church of San Nicolás de Soria in Spain.
 * Becket's assassination made an impact in Spain: within five years of his death Salamanca had a church named after him, Iglesia de Santo Tomás Cantuariense.
 * Monumental frescoes with the martyrdom of Thomas Becket were depicted in the romanesque church of Santa Maria in Terrassa.
 * Geoffrey Chaucer's The Canterbury Tales features a company of pilgrims travelling from Southwark to Becket's shrine in Canterbury Cathedral.
 * The story of Becket's life became a popular theme for medieval Nottingham Alabaster carvers. One set of Becket panels is shown in the Victoria and Albert Museum.
 * The arms of the City of Canterbury, officially registered in 1619 but dating back to at least 1380, is based on the attributed arms of Thomas Becket: Argent, three Cornish choughs proper, with the addition of a chief gules charged with a lion passant guardant or from the Royal Arms of England.
 * In 1884, England's poet laureate Alfred, Lord Tennyson wrote Becket, a play about Thomas Becket and Henry II that Henry Irving produced after Tennyson's death and played in the title role.
 * Modern works based on the Becket story include: T. S. Eliot's play Murder in the Cathedral, adapted as the opera Assassinio nella cattedrale by Ildebrando Pizzetti; Jean Anouilh's play Becket, where Becket is not a Norman but a Saxon, adapted for the screen in 1964, and starring Peter O'Toole and Richard Burton; and Paul Webb's play Four Nights in Knaresborough, which Webb adapted for the screen, selling the rights to Harvey and Bob Weinstein. The power struggle between Church and King is a theme of Ken Follett's novel The Pillars of the Earth, where a late scene features the murder of Becket. An oratorio by David Reeves, Becket (The Kiss of Peace), was premièred in 2000 at Canterbury Cathedral, where the event had occurred, as a part of the Canterbury Festival, and a fundraiser for the Prince's Trust.
 * The Becket Fund for Religious Liberty, a non-profit, non-partisan legal and educational institute fostering free expression for religious traditions took its inspiration from Thomas Becket.
 * In a 2006 poll by BBC History magazine for "worst Briton" of the previous millennium, Becket came second behind Jack the Ripper. The poll was dismissed as "daft" in The Guardian, and the result disputed by Anglicans and Catholics. Historians had nominated one person per century, and for the 12th century John Hudson chose Becket for being "greedy", "hypocritical", "founder of gesture politics" and "master of the soundbite". The magazine editor suggested most other nominees were too obscure for voters, as well as saying, "In an era when thumbscrews, racks and burning alive could be passed off as robust law and order—being guilty of 'gesture politics' might seem something of a minor charge."
 * The many UK churches dedicated to Thomas Becket include Cathedral Church of St Thomas of Canterbury, Portsmouth, St Thomas of Canterbury Church, Canterbury, Church of St Thomas the Martyr, Monmouth, St Thomas à Becket Church, Pensford, St Thomas à Becket Church, Widcombe, Church of St Thomas à Becket, Capel, St Thomas the Martyr, Bristol, and St Thomas the Martyr's Church, Oxford. Those in France include Église Saint-Thomas de Cantorbéry at Mont-Saint-Aignan, Upper-Normandy, Église Saint-Thomas-Becket at Gravelines (Nord-Pas-de-Calais), Église Saint-Thomas Becket at Avrieux (Rhône-Alpes), and Église Saint-Thomas Becket at Bénodet (Brittany),
 * Among his obligations in contrition to Henry, William de Tracy much enlarged and re-dedicated to St Thomas of Canterbury the parish church in Lapford, Devon, in his manor of Bradninch. The martyrdom day is still marked by a Lapford Revel.
 * British schools named after Thomas Becket include Becket Keys Church of England School and St Thomas of Canterbury Church of England Aided Primary School.
 * British hospitals named after Thomas Becket include St Thomas' Hospital.
 * Part of the Hungarian city of Esztergom is named Szenttamás ("Saint Thomas"), on a hill called "Szent Tamás" dedicated to Thomas Becket – a classmate of Lucas, Archbishop of Esztergom in Paris.
 * In the treasury of Fermo Cathedral is the Fermo chasuble of St. Thomas Becket, on display at Museo Diocesano
 * Thomas Becket is honoured in the Church of England and in the Episcopal Church on 29 December.

Biographies

 * Anne Duggan, 2005, Thomas Becket, London: Hodder Arnold
 * John Guy, 2012, Thomas Becket: Warrior, Priest, Rebel, Random House
 * David Knowles 1970, Thomas Becket, London: Adam & Charles Black
 * Richard Winston, 1967, Thomas Becket, New York: Alfred A. Knopf

Historiography

 * James W. Alexander, "The Becket controversy in recent historiography", Journal of British studies 9.2 (1970): 1–26. in JSTOR
 * Anne Duggan, 1980, Thomas Becket: A Textual History of his Letters, Oxford: Clarendon Press
 * Anne Duggan, ed., 2000, The Correspondence of Thomas Becket, Archbishop of Canterbury (1162–1170). 2 vols, Oxford: Clarendon Press
 * Carles Sánchez Márquez, 2021, A painted tragedy. The martyrdom of Thomas Becket in Santa Maria de Terrassa and the diffusion of its cult in the Iberian Peninsula, La Seu d'Urgell: Anem Editors

title: Thomas Becket


text:
Jonathan Edwards

Jonathan Edwards may refer to:

Musicians

 * Jonathan and Darlene Edwards, pseudonym of bandleader Paul Weston and his wife, singer Jo Stafford
 * Jonathan Edwards (musician) (born 1946), American musician
 * Jonathan Edwards (album), debut album of the musician
 * Jonathan Edwards, known as John Edwards, American R&B singer

Political figures

 * Jonathan Edwards (New York politician) (1798–1875), American lawyer and politician
 * Jonathan Edwards (Welsh politician) (born 1976), Member of Parliament since 2010

Religious figures

 * Jonathan Edwards (priest) (1615–1681), Archdeacon of Derry
 * Jonathan Edwards (academic) (1629–1712), theologian and Principal of Jesus College, Oxford 1686–1712
 * Jonathan Edwards (theologian) (1703–1758), American revivalist, preacher, theologian; president of Princeton University
 * Jonathan Edwards (the younger) (1745–1801), his son, American theologian

Sports figures

 * Jonathan Edwards (triple jumper) (born 1966), British triple jumper, world record holder and TV presenter
 * Jonathan Edwards (luger) (born 1972), American luger
 * Johnathan Edwards (born 1984), Welsh rugby union footballer
 * Jon Edwards (baseball) (born 1988), American Major League player
 * Jonathan Edwards (English footballer) (born 1996), English footballer

Others

 * Jonathan Edwards (Washington & Jefferson College) (1817–1891), first president of Washington & Jefferson College
 * Jonathan Edwards (numismatist) (1841–1886), American physician and numismatist
 * Jonathan Edwards (poet) (born 1979), Welsh poet

title: Jonathan Edwards