who was the man in the iron mask?

best answer
28 July 1669. The Man in the Iron Mask ( French LHomme au Masque de Fer; died 19 November 1703) was an unidentified prisoner of state during the reign of King Louis XIV of France (1643–1715). Warranted for arrest on 28 July 1669 under the pseudonym of Eustache Dauger he was incarcerated on 24 August and held for 34 years in the custody of the same jailer Bénigne Dauvergne de Saint-Mars in four successive French prisons including the Bastille.