The Man in the Iron Mask is a 1977 television film loosely adapted from the 1847-1850 novel The Vicomte de Bragelonne by Alexandre Dumas and presenting several plot similarities with the 1939 film version. It was produced by Norman Rosemont for ITC Entertainment, and starred Richard Chamberlain as King Louis XIV and his twin Philippe, Patrick McGoohan as Nicolas Fouquet, Ralph Richardson as Jean-Baptiste Colbert, Louis Jourdan as D'Artagnan, and Ian Holm as the Chevalier Duval. Jenny Agutter plays Louis XIV's mistress, Louise de la Vallière and Vivien Merchant appears as Queen Marie-Therese. It was directed by Mike Newell.
(Summary from Wikipedia)