The Sword in the Stone
The Sword in the Stone story tells of a sword fixed in a stone that can only be removed by the true king of Britain. Many try and fail. Then a young man called Arthur successfully pulls the sword from the stone and becomes King Arthur.
Some writers of Arthurian legend say this sword was Excalibur, a weapon thought to have had magical powers. Others say that Excalibur was a different sword, given to Arthur by the Lady of the Lake some time into his reign.
Shortly before his death, Arthur instructed a Knight of the Round Table to return Excalibur to the Lady of the Lake. The knight failed twice to carry out the request. He felt such a great sword should not be thrown away. Finally he carried out his task, however, and threw Excalibur into the enchanted lake and watched as a hand emerged to catch it.