Well, according to the wikipedia page on Excalibur, depending on the story, some...

Declanomous on Aug 4, 2016 | parent | context | favorite | on: Royal palace discovered in area believed to be bir...

Well, according to the wikipedia page on Excalibur, depending on the story, sometimes the Sword in the Stone and Excalibur are one and the same, and sometimes they aren't.