King Arthur was the second known wielder of Soul Calibur. Legends speak of certain events of the 6th century, in which the King of the Britons defeated the King of the Saxons who had come to possess an evil blade.
King Arthur had been given an "unbreakable blade" and two artifacts by a certain woman. When King Arthur approached the blade and took it in hand, it transformed into what came to be known as Excalibur.
After the death of the king, the three artifacts were scattered until they were once again brought together in the 9th century by Edge Master, who then entrusted the 'Three Sacred Treasures' to the Ling Sheng-Su temple.