Man in the Iron Mask one ever saw his face because it was hidden by a mask of black velvet cloth, the true identity of the prisoner remains a mystery; it has been extensively debated by historians, and various theories have been expounded in numerous books and films. Among the leading theories are those proposed by writer and philosopher Voltaire: he claimed in the second edition of his "Questions sur l'Encyclopédie" (1771) that the prisoner wore a mask made of iron rather than of cloth, and that he was the older, illegitimate brother of Louis XIV. What little is known about the historical Man in
The Man with the Iron Heart (film) The Man with the Iron Heart (film) The Man with the Iron Heart (released as HHhH in France and Killing Heydrich in Canada) is an English-language French-Belgian biographical war drama-thriller film directed by Cédric Jimenez and written by David Farr, Audrey Diwan, and Jimenez. It is based on French writer Laurent Binet's novel "HHhH", and focuses on "Operation Anthropoid", the assassination of Nazi leader Reinhard Heydrich in Prague during World War II. The film stars Jason Clarke, Rosamund Pike, Jack O'Connell, Jack Reynor, and Mia Wasikowska. It was shot in Prague and Budapest from September 2015 until February 2016. The