Excalibur
Excalibur is the legendary sword of King Arthur, sometimes also attributed with magical powers or associated with the rightful sovereignty of Britain. It was associated with the Arthurian legend very early on. Excalibur and the Sword in the Stone are in some versions said to be different, though in most incarnations they are the same. In Welsh, it is called Caledfwlch; in Cornish, Calesvol; in Breton, Kaledvoulc'h; and in Latin, Caliburnus. Several similar swords and other weapons also appear in this and other legends.
