His Highness, The Prince (1913)

In the small kingdom of Snobbéria, a rollicking tale of mistaken identity unfolds. A busy journalist called Herbert Prince sets out for a much-needed holiday, and while on the train he is mistaken for Prince Karl Heinrich of Snobbéria. Deciding to have a little fun, Prince stays in character as a royal. Upon arriving in his holiday destination of Waldeck, he is effusively received by the mayor, with whose daughter Prince immediately falls in love. Soon the real prince, Karl Heinrich, reads about the supposedly royal visit and sets off to surprise his doppelganger. (Stumfilm.dk)