The Dragon Ring (1994)

Desideria is the eldest daughter of the Dragon King and Queen and heir to the throne and the Dragon Ring. If she marries a prince, that is. However, when she finds her prince, he turns out to be a rebel prince held captive by her father. Who, when he finds out that she tried to help the prince escape, decides to let all the princes in his conquered kingdoms fight in a tournament for her hand in marriage. Meanwhile her jealous adopted sister tries to get rid of her.