premise: Stephen Moyer acted in a film adaptation of a book.
hypothesis: Prince Valiant is a 1997 Irish-British independent sword and sorcery film directed by Anthony Hickox , written by Michael Frost Beckner , and starring Stephen Moyer , Katherine Heigl , Thomas Kretschmann , Joanna Lumley , Ron Perlman , and Edward Fox . It is a loose adaptation of the long-running Prince Valiant comic strip of Hal Foster , some panels of which were used in the movie . Stephen Moyer ( born Stephen John Emery ; 11 October 1969 ) is an English film and television actor and director who is best known as vampire Bill Compton in the HBO series True Blood . In 1997 , Moyer made his big-screen debut landing the lead role in the film adaptation of the long-running comic strip Prince Valiant by Hal Foster , working alongside Ron Perlman and Katherine Heigl .