The Iron Mask
Le masque de fer (original)
The story of the Three Musketeers, D'Artagnan, and the imprisonment in an iron mask of the identical twin of the King of France, Louis XIV.
Starring Jean Marais, Sylva Koscina, Jean-François Poron, Gisèle Pascal, Philippe Lemaire, Noël Roquevert, Jean Rochefort, Claudine Auger, Jean Lara, Germaine Montero
It's a action & adventure movie, and has a rating of 5.8 out of 10 from Imdb which is fairly okay for this kind of movie.
Watch it here
Not found streaming from Ireland.