A Knight's Tale.
One of my favorite movies of all time. Heath Ledger is a knight's squire who, after said knight dies, takes a shot at replacing said knight (even though this is fairly likely to get everyone killed because you have to be a noble to be a knight). Long story short and minus spoilers, it's a fun and ever so slightly emotional journey that, while fairly traditional in how it plays out, is nonetheless very well done. Also, people's trumpets inexplicably play Queen, and it is awesome.
EDIT: Because I can't stand to say just one movie, there's also Ip Man, Ip Man 2, and The Legend is Born: Ip Man. All of them are very well done movies based on the life of Yip Man, a grandmaster of Wing Chun and one of Bruce Lee's teachers. They do an excellent job of realistically portraying the Wing Chun style and martial arts in general, while also having a great story to each of them. They are a bit vaguely insulting to the Japanese and British, as they are villains in the tales due to the things they did to China and the Chinese, but it isn't so much so that it is unenjoyable or anything. And really, they had a bit of reason to be insulting, what with the invading and racism they experienced.