Fortunately, all those historical accounts of a King Arthur ARE mostly myths... so I can just make mine up as I go along. There is a general consensus of him living around the late 5th and early 6th centuries, so I'm going along with that as well.
TRANSCRIPTION COURTESY OF JOSEPH HOUK - [495; The man with the crown accosteth our adventurers] (MG, unimpressed by the getup) "And you arrre…?" (BG, smacking him) "Matt, SHH!" (King) "I am Arthur, King of the Britons! I hath witnessed a vision of a giant serpent and I demand to know the source of it! (BG) "We mean no harm, your highness! This is pure illusion! Watch…" (Merlin) "Abracadabra… Golden Sword!" [And out comes a 3-D Gold sword!] (Arthur) "Quite a wonder to behold!" (MG, reaching through the sword) "And see? My hand's not harmed at all! 'Tis all spectacle!" (Arthur) "State they name, mystical elder!" (Merlin) "Myrtlini…" (Random Soldier, with sword drawn) "THY MAJESTY! A horde of barbarians approacheth!"