<P> William returns to the tournament to face Adhemar in the final match, but Adhemar cheats with an illegally sharpened lance, piercing William's shoulder and seriously injuring him . Entering the final pass, William is losing by two lances and must unhorse Adhemar to win . He demands to be stripped of his armour while Chaucer buys time by performing the introduction of William that he omitted earlier . Finally he tilts against Adhemar, with his father and Jocelyn in attendance . Bellowing his true name as he tilts, he knocks Adhemar to the ground with a crushing blow . Over his defeat, Adhemar experiences a vision of William and his friends mocking him that he has been weighted, measured and found wanting (ironically just like Adhemar did to William before). In the ensuing celebration, as Jocelyn and William embrace, Chaucer remarks that he should write this whole story down . </P> <Ul> <Li> Heath Ledger as William Thatcher / Sir Ulrich von Liechtenstein <Ul> <Li> Leagh Conwell as young William Thatcher </Li> </Ul> </Li> <Li> Rufus Sewell as Count Adhemar </Li> <Li> Shannyn Sossamon as Jocelyn </Li> <Li> Mark Addy as Roland </Li> <Li> Alan Tudyk as Wat </Li> <Li> Paul Bettany as Geoffrey Chaucer </Li> <Li> Laura Fraser as Kate </Li> <Li> Bérénice Bejo as Christiana </Li> <Li> James Purefoy as Edward, the Black Prince / Sir Thomas Colville </Li> <Li> Christopher Cazenove as John Thatcher </Li> <Li> Nick Brimble as Sir Ector </Li> <Li> Roger Ashton - Griffiths as Old Bishop </Li> <Li> Steven O'Donnell as Simon the Summoner </Li> <Li> Jonathan Slinger as Peter the Pardoner </Li> <Li> Alice Connor as Lone Girl in Cheapeside </Li> <Li> Berwick Kaler as Man in Stocks </Li> </Ul> <Li> Heath Ledger as William Thatcher / Sir Ulrich von Liechtenstein <Ul> <Li> Leagh Conwell as young William Thatcher </Li> </Ul> </Li> <Ul> <Li> Leagh Conwell as young William Thatcher </Li> </Ul>

Who plays young william in a knight's tale