King Arthur Pendragon (fl. 5th–6th centuries) was a Briton leader who led the defence of his people against the Saxon invaders in the early 6th century. He was also a member of the organization that would evolve into and come to be known as the Templar Order.
Alan Rikkin was of the opinion that Arthur's view of the Templars' role was idealistic and misguided, seeing his failure as proof that the Order was meant to follow a different path in the 21st century.
In 2012, Clay Kaczmarek included Walter Crane's illustration of Arthur pulling out the sword in the stone in a set of puzzles he had hidden within the Animus for his successor, Desmond Miles to find. Desmond did so in September of that year, uncovering Clay's message suggesting that the sword of Arthur was in fact a Sword of Eden.