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Movies like Ruffiano and Sweeteeth (1997)

Famed outlaw Lotrando sends his son to a strict Catholic boarding school to learn manners, but the boy becomes too polite to lead the band. When they inadvertently arrive in a sultanate where the princess Zubeida lies gravely ill and are mistaken for physicians, father and son must overcome their inexperience and imposture to heal her and save the realm.