Excalibur
Geoffrey of Monmouth, in his "Historia Regum Britanniae" ("The History of the Kings of Britain", c. 1136), Latinised the name of Arthur's sword as "Caliburnus" (potentially influenced by the Medieval Latin spelling "calibs" of Classical Latin "chalybs", from 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"). In the late 15th/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.
Excalibur (film)
Excalibur is a 1981 American epic fantasy film directed, produced, and co-written by John Boorman that retells the legend of King Arthur and the knights of the Round Table, based on the 15th-century Arthurian romance "Le Morte d'Arthur" by Thomas Malory. It stars Nigel Terry as Arthur, Nicol Williamson as Merlin, Nicholas Clay as Lancelot, Cherie Lunghi as Guenevere, Helen Mirren as Morgana, Liam Neeson as Gawain, Gabriel Byrne as Uther Pendragon, Corin Redgrave as Cornwall, and Patrick Stewart as Leondegrance. The film is named after the legendary sword of King Arthur that features prominently in Arthurian literature. The film's soundtrack features the music of Richard Wagner and Carl Orff, along with an original score by Trevor Jones.