Caliburn to Excalibur
Geoffrey of Monmouth's History of the Kings of Britain is the first non-Welsh source to speak of the sword. Geoffrey says the sword was forged in Avalon and Latinises the name "Caledfwlch" as Caliburnus. When his influential pseudo-history made it to Continental Europe, writers altered the name further until it finally took on the popular form Excalibur (various spellings in the medieval Arthurian Romance and Chronicle tradition include: Calabrun, Calabrum, Calibourne, Callibourc, Calliborc, Calibourch, Escaliborc, and Escalibor[14]). The legend was expanded upon in the Vulgate Cycle, also known as the Lancelot-Grail Cycle, and in the Post-Vulgate Cycle which emerged in its wake. Both included the work known as the Prose Merlin, but the Post-Vulgate authors left out the Merlin Continuation from the earlier cycle, choosing to add an original account of Arthur's early days including a new origin for Excalibur.
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