Does anyone know the name of a movie that was based in the Middle ages?

It wasnt a blockbuster hit and im pretty sure the cast was all unknowns. It was about a rich girl or princess who stowed away with the bandits that attacked her castle and i think her and the head bandit have sex and she goes with them to attack another castle where she chases a woman (that was either a nun or a nanny) holding a boy onto the rooftop and then the nanny jumps off the roof with the boy. Thats pretty much all i remember about the movie.