Looking for a name of a movie?

have googled it but cannot find it. I am looking for the name of a movie about a king who falls in love with a mistress and she is set up by his men and tells the king she was spotted with another man in walking in the court yard (a friend of hers) he becomes angry and banishes her from his room and does not send for her again.. her friend convinces her to leave the castle but she refuses and in the end the king sees that she was always on his side and not a betrayer.