King Arthur was a legendary 6th century ruler of Britain who united the Britons against invading tribes. He pulled the magical sword Excalibur from the Stone, establishing his right to rule. Arthur was advised by the wizard Merlin and lived with his knights at Camelot. However, Arthur's nephew Mordred betrayed him and declared himself king, leading to a final battle where Arthur and Mordred killed each other. In the end, the Lady of the Lake took the dying Arthur by boat to the mystical Isle of Avalon, where he would one day rise again.