A warrior proves himself to his King, the King gives him a job as one of his trusted generals. He is away from his wife for a while, while he is his village is taken over and he is surprised when his wife is there but as the King's personal play thing. The warrior has to watch as his wife is used and abused. Maybe he rescues her and over throws the king.
(either male character can be the primary character)
This could also be played with a prince instead of a warrior, and a commoner girl who has taken the prince's heart. The king could find out about the secret relationship and try to get his son to stop feeling for this girl.