Excalibur

Excalibur is the mythical sword of King Arthur that was purported to possess magical powers and be associated with the rightful sovereignty of Britain. Its first reliably datable appearance is found in Geoffrey of Monmouth's Historia Regum Britanniae. Excalibur as the "sword in the stone" functioning as the proof of Arthur's lineage is an iconic motif featured throughout most works dealing with Ar... (Wikipedia)