Does anyone know the story with King Arthur in it?

Excalibur is the legendary sword of King Arthur, sometimes' attributed with magical powers or ociated with the rightful sovereignty of Great Britain. Sometimes Excalibur and the Sword in the Stone (the proof of Arthur's lineage) are said to be the same weapon, but in most versions they are considered separate. The sword was ociated with the Arthurian legend very early. In Welsh, the sword is called Caledfwlch.