The presence of two other actors is a highlight for me: Billy Connelly, who played Uncle Monty in A Series of Unfortunate Events, is a professor here, rather like Monty except that his penchant is for medieval history instead of snakes, and David Thewlis, who is the project head for the Amoral Corporation. You may know him as Professor Lupin. Predictably, the movie is poor history: the opposing armies each wear uniforms, red for the villainous English and blue for the valiant French. Each speaks modern English or French, with the only barrier to communication being that a French woman doesn't understand Marek's euphemisms when he attempts to chat her up. "Am I seeing anyone? I see you..."
Timeline doesn't do justice to the book, and it's not a particularly good movie by itself, but if you're really in the mood for swords and bows, it should prove entertaining, especially seeing as it features Gerard Butler, who I became a fan of while watching it. You might be better off with Men in Tights, however, which has as much historical integrity and much better acting.