Excalibur

Excalibur is a movie starring Nigel Terry, Helen Mirren, and Nicholas Clay. Merlin the magician helps Arthur Pendragon unite the Britons around the Round Table of Camelot, even as dark forces conspire to tear it apart.
A surreal adaptation of Sir Thomas Malory's "Le Morte d'Arthur", chronicling Arthur Pendragon's conception, his rise to the throne, the search by his Knights of the Round Table for the Holy Grail, and ultimately his death.