King Arthur King Arthur, the legendary King of the Kingdom of Avalon, is the best-known character of the Matter of Britain. In these stories, King Arthur lives extraordinary adventures and battles from the very moment of his birth. The son of King Uther Pendragon, he was raised by the warlock Merlin, who taught him how to become the future king of Avalon. Different stories and legends relate him to the mythical sword Excalibur, which only he managed to get out from a magic stone. He
married
Queen
Guinevere,
but
had
difficult
moments when she and the knight Lancelot had a love affair. As the leader of the Knights of the Round Table, King Arthur still leads his knights through legend, history and myth in Great Britain and all over the world.