Answer
The Man in the Iron Mask, a 1998 film, featured Gabriel Byrne in the role of D'Artagnan. The film, set in 17th-century France, follows the story of a masked prisoner who is believed to be the twin brother of King Louis XIV. Byrne's character, D'Artagnan, is a retired musketeer who is drawn into the intrigue surrounding the masked prisoner and the king.