There will not be a story about Merlin if there is no King Arthur. Although it is not specified whether King Arthur is a wizard or just a regular human, in the Harry Potter universe, King Arthur's ...

However, the story of Arthur's sword, Excalibur, may have had its roots in Welsh literature. While it was not said to have possessed magical properties, Geoffrey of Monmouth mentions a weapon, ...

Uthur Pendragon (Gabriel Byrne) is given the mystical sword Excalibur by the wizard Merlin. At his death, Uthur buries the sword into a stone, and the next man that can pull it out will be King of ...