Excalibur

Excalibur is the mythical sword of King Arthur that may possess magical powers or be associated with the rightful sovereignty of Britain. Its first reliably datable appearance is found in Geoffrey of Monmouth's Historia Regum Britanniae. Excalibur as the "sword in the stone" functioning as the proof of Arthur's lineage is an iconic motif featured throughout most works dealing with Arthur's youth since its introduction in Robert de Boron's Merlin. The sword given to the young Arthur by the Lady of the Lake in the tradition that began soon afterwards with the Post-Vulgate Cycle is not the same weapon, but in Le Morte d'Arthur both of them share the name of Excalibur. Several similar swords and other weapons also appear within Arthurian texts, as well as in other legends.

The name Excalibur ultimately derives from the Welsh Caledfwlch (Breton Kaledvoulc'h, Middle Cornish Calesvol), which is a compound of caled, 'hard', and bwlch, 'breach, cleft'. Caledfwlch appears in several early Welsh works, including the prose tale Culhwch and Olwen (c. 11th–12th century). The name was later used in Welsh adaptations of foreign material such as the Bruts (chronicles), which were based on Geoffrey of Monmouth. It is often considered to be related to the phonetically similar Caladbolg, a sword borne by several figures from Irish mythology, although a borrowing of Caledfwlch from the Irish Caladbolg has been considered unlikely by Rachel Bromwich and D. Simon Evans. They suggest instead that both names "may have similarly arisen at a very early date as generic names for a sword". In the late 15th to early 16th-century Middle Cornish play Beunans Ke, Arthur's sword is called Calesvol, which is etymologically an exact Middle Cornish cognate of the Welsh Caledfwlch. It is unclear if the name was borrowed from the Welsh (if so, it must have been an early loan, for phonological reasons), or represents an early, pan-Brittonic traditional name for Arthur's sword.

Welsh author Geoffrey of Monmouth, in his Latin chronicle Historia Regum Britanniae (The History of the Kings of Britain, c. 1136), Latinised the name of Arthur's sword as Caliburnus (possibly influenced by the Medieval Latin spelling calibs of Classical Latin chalybs, from the Greek chályps (χάλυψ), 'steel'). Most Celticists consider Geoffrey's Caliburnus to be derivative of a lost Old Welsh text in which bwlch (Old Welsh bulc[h]) had not yet been lenited to fwlch (Middle Welsh vwlch or uwlch). Geoffrey Gaimar, in his Old French chronicle Estoire des Engleis (1134–1140), mentions Arthur and his sword: "this Constantine was the nephew of Arthur, who had the sword Caliburc" ("Cil Costentin, li niès Artur, Ki out l'espée Caliburc"). In Wace's Roman de Brut (c. 1150–1155), composed in Old French, the sword is called Caliburn (Chaliburne, Caliburne, Calibuerne), Calabrum, Callibourc, Calabrun, Chalabrun, and Escalibor (with additional variant spellings such as Chalabrum, Calibore, Callibor, Caliborne, Calliborc, Escallibore found in various continental manuscripts). Various other spellings in the later medieval Arthurian literature have included Calibourch, Calibourn, Calibourne, Caliburc, Escaliber, Escalibur, Excalibor, and finally the familiar Excalibur.

Romance tradition elaborates on how Arthur pulled out Excalibur. In Robert de Boron's c. 1200 French poem Merlin, the first known tale to mention the "sword in the stone" motif, Arthur obtained the British throne by pulling a sword from an anvil sitting atop a stone that appeared in a churchyard on Christmas Eve. In this account, as foretold by Merlin, the act could not be performed except by "the true king", meaning the divinely appointed king or true heir of Uther Pendragon. (As Thomas Malory related in his English-language Arthurian compilation, the 15th-century Le Morte d'Arthur, "whoso pulleth out this sword of this stone and anvil, is rightwise king born of all England.") The scene is set by different authors at either explicitly London (historical Londinium) or generally in the land of Logres (which can be a city and also associated with London), and might have been inspired by a miracle attributed to the 11th-century bishop Wulfstan of Worcester.

After many of the gathered nobles try and fail to complete Merlin's challenge, the teenage Arthur, who up to this point had believed himself to be the biological son of Ector and had gone there as a squire to his foster brother Kay, succeeds effortlessly. Arthur first achieves this feat by accident while unaware of the contest and unseen. He then returns the sword to its place in the anvil on a stone, and later repeats the act publicly as Merlin comes to announce his true parentage.

The identity of this sword as Excalibur is made explicit in the Prose Merlin, a part of the thirteenth-century Lancelot-Grail cycle of French romances also known as the Vulgate Cycle. Eventually, in the cycle's finale Vulgate Mort Artu, when Arthur is at the brink of death, he enigmatically orders his surviving knight Griflet to cast Excalibur into a nearby lake. After two failed attempts to deceive Arthur, since Griflet felt that such a great sword should not be thrown away, he finally does comply with the wounded king's request. A woman's hand emerges from the lake to catch Excalibur, after which Morgan appears in a boat to take Arthur to Avalon. This motif then became attached to Bedivere (or Yvain in the chronicle Scalacronica), instead of Griflet, in the English Arthurian tradition.

However, in the subsequent Post-Vulgate Cycle variants of the Merlin and the Merlin Continuation, written soon afterwards, Arthur's sword drawn from the stone is unnamed. Furthermore, the young Arthur promptly breaks it in his duel against King Pellinore very early in his reign. On Merlin's advice, Arthur then goes with him to be given the actual Excalibur by a Lady of the Lake in exchange for a later boon for her (some time later, she arrives at Arthur's court to demand the head of Balin). In the Post-Vulgate Mort Artu, it is this sword that is eventually hurled into the pool at Camlann (or actually Salisbury Plain where both cycles locate the battle, as do the English romances) by Griflet in the same circumstances as told in the story's Vulgate version. Malory included both of these stories in his now-iconic Le Morte d'Arthur while naming each of the swords as Excalibur: both the first one (from the stone), soon shattered in combat in a story taken from the Post-Vulgate Merlin Continuation, and its replacement (from the lake), returned by Bedivere in the end.

In the Welsh tales, Arthur's sword is known as Caledfwlch. In Culhwch and Olwen, it is one of Arthur's most valuable possessions and is used by Arthur's warrior Llenlleawg the Irishman to kill the Irish king Diwrnach while stealing his magical cauldron. Though not named as Caledfwlch, Arthur's sword is described vividly in The Dream of Rhonabwy, one of the tales associated with the Mabinogion (as translated by Jeffrey Gantz): "Then they heard Cadwr Earl of Cornwall being summoned, and saw him rise with Arthur's sword in his hand, with a design of two chimeras on the golden hilt; when the sword was unsheathed what was seen from the mouths of the two chimeras was like two flames of fire, so dreadful that it was not easy for anyone to look."