Who were the characters and their roles in the movie King Arthur?

In the movie "King Arthur" (2004), the main characters include Arthur, played by Clive Owen, who is the legendary leader of the Knights of the Round Table; Guinevere, portrayed by Keira Knightley, who is a fierce warrior and Arthur's love interest; and Lancelot, played by Ioan Gruffudd, who is one of Arthur's loyal knights. The film also features Merlin, a wise sorcerer, and the Saxon leader, Cerdic, who opposes Arthur's quest for unity. Together, these characters navigate themes of loyalty, honor, and the struggle for power in a tumultuous time.