The Man in the Iron Mask (1939)

D'Artagnan and the musketeers are the only ones who know of the existence of a twin brother, and Fouquet uses his influence to keep everyone silenced. The main story was changed by portraying Louis XIV as selfish, cruel, and incompetent, and Philippe the kind-hearted brother who is raised by D'Artagnan and the musketeers and does not even know that he has an identical twin. When the truth is discovered, Louis XIV has Philippe imprisoned with the iron mask placed on him, hoping that Philippe's beard will grow inside the mask and eventually strangle him.