Count Adhemar is a character from the 2001 film "A Knight's Tale," directed by Brian Helgeland. He serves as an antagonist to the main character, William Thatcher, who aspires to become a knight. Adhemar is portrayed as a nobleman with a strong sense of honor and tradition, often clashing with William's unconventional approach to knighthood. In the film, Count Adhemar is played by Rufus Sewell. He is depicted as a skilled jouster and a formidable opponent, representing the established order of chivalry that William seeks to challenge. His character embodies the themes of rivalry and the struggle for identity within the context of medieval tournaments.