The Man in the Iron Mask was an unidentified prisoner of state during the reign of King Louis XIV of France (1643–1715). Warranted for arrest on 19 July 1669 under the pseudonym of "Eustache Dauger", he was apprehended on 28 July, incarcerated on 24 August, and held for 34 years in the custody of the same jailer,, in four successive French prisons, including the Bastille. Wikipedia