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460 CE - 560 CE: Probable dates for historical Arthur, King of the Britons.
830 CE: Welsh Historian Nennius first mentions Arthur as king and hero of Battle of Badon Hill.
1095 CE - 1143 CE: Life of historian William of Malmesbury who mentions Arthur as war-chief of Britons, not king.
1130 CE - 1190 CE: Life of French Poet Chretien de Troyes who introduces Grail Quest, Lancelot, and other elements to Arthurian Legend; calls sword Escalibur.
1136 CE: Geoffrey of Monmouth's History of the Kings of Britain introduces Arthurian Legend and Arthur's sword as Caliburn.
1160 CE: French Poet Wace develops Arthurian Legend further, adds Round Table, calls sword Chaliburn.
1170 CE - 1220 CE: Life of German Poet Wolfram von Eschenbach who develops Arthurian Legend in his poem Parzival.
1190 CE: French Poet Robert de Boron develops Arthurian Legend further including Grail Quest, Merlin, Sword in the Stone.
1190 CE - 1220 CE: Layamon translates Arthurian Legends into English.
1200 CE: The Welsh Mabinogion influences development of Arthurian Legend.
1210 CE: Gottfried von Strassburg writes Tristan, contributes to Arthurian Legend.
1215 CE - 1235 CE: The Vulgate Cycle of the Arthurian Legend composed in English Prose; Arthur's sword is Excalibur.
1469 CE: Sir Thomas Malory composes Le Morte D'Arthur, definitive version of Arthurian Legend including Excalibur as the king's sword.
1485 CE: Le Morte D'Arthur published by William Caxton, becomes instant best-seller popularizing Arthurian Legend.