A Son of the Immortals (1916)

General Stampoff takes control in Kosnovia, and to insure his position as the country's strong man, he installs Prince Alexis Delgrade, the idle son of Prince Michael, as the titular ruler. Alexis surprises everyone, however, and shocks the reactionary Stampoff, by instituting a series of democratic reforms. However, his public success cannot make up for his personal problems, as Alexis is unable to marry his sweetheart, Joan Cameron, because she was born in America and thus could not reign as queen. Then, Alexis discovers that his mother came from Indiana, thereby making him as much an American as a Kosnovian, and also invalidating his claim to the throne. As a result, he abdicates and marries Joan, while Michael, vowing to maintain his son's democratic policies, takes over as king.