William Thatcher is a fictional character from the 2001 film A Knight's Tale, directed by Brian Helgeland. He is portrayed by actor Heath Ledger and is a peasant who dreams of becoming a knight. To achieve his goal, William adopts the identity of a nobleman and participates in jousting tournaments, showcasing his skills and determination. Throughout the film, William faces various challenges, including rival knights and societal expectations. His journey highlights themes of honor, friendship, and the pursuit of dreams, as he navigates the complexities of medieval life while striving to prove himself in the world of chivalry.