Les Aventures de Lagardère (1968)

A young man, Lagardère, discovers that a plot is afoot to assassinate the Duke of Nevers. He warns him and flees with his daughter, Aurore. Fifteen years pass. Lagardère has raised Aurore as his own, but her mother seeks her out and has her abducted by her men. With the help of two friends, Lagardère rescues the girl and confronts her kidnappers.