Claim: David Thewlis won the Best Actor award at Cannes Film Festival.
Evidence: Other notable performances include the films Naked -LRB- for which he won the Best Actor award at Cannes Film Festival -RRB- , Dragonheart , Kingdom of Heaven , The Boy in the Striped Pyjamas , The Theory of Everything , Black Beauty , and Macbeth -LRB- in which he played King Duncan -RRB-.