From Broadway to a Throne (1916)

Just before a big bout, Jimmie, a New York prize fighter, gets a lucky medal from his friend Billy. Herman Marlex, a chronic teller of tall tales informs Jimmie that the medal is really a royal one, worn by the infant Prince of Magonia when he was kidnapped years before. Then, on fight night, Jimmie is knocked senseless. On his way home, Magonian emissaries see him wearing the medal, and so haul him back to the "homeland." Despite his insisting that he is merely a boxer, Jimmie is hailed as the returning prince.