Excalibur aka Caliburn

Excalibur is the legendary sword of King Arthur, sometimes' attributed with magical powers or associated 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 associated with the Arthurian legend very early. In Welsh, the sword is called Caledfwlch.In Arthurian romance a number of explanations are given for Arthur's possession of Excalibur. In Robert de Boron's Merlin, Arthur obtained the throne by pulling a sword from a stone. In this account, the act could not be performed except by "the true king," meaning the divinely appointed king or true heir of Uther Pendragon. This sword is thought by many to be the famous Excalibur and the identity is made explicit in the later so-called Vulgate Merlin Continuation, part of the Lancelot-Grail cycle.[4] However, in what is sometimes called the Post-Vulgate Merlin, Excalibur was given to Arthur by the Lady of the Lake sometime after he began to reign. She calls the sword "Excalibur, that is as to say as Cut-steel." In the Vulgate Mort Artu, Arthur orders Girflet to throw the sword into the enchanted lake. After two failed attempts he finally complies with the wounded king's request and a hand emerges from the lake to catch it, a tale which becomes attached to Bedivere instead in Malory and the English tradition.[5]
Malory records both versions of the legend in his Le Morte d'Arthur, and confusingly calls both swords Excalibur. The film Excalibur attempts to rectify this by having only one sword, which Arthur draws from the stone and later breaks; the Lady of the Lake then repairs it.