Voltaire ventured at length to speak more openly of the prisoner than anyone had hitherto done, and to treat as a matter of history “an event long ignored by all historians.” (vol. ii. p. 11, 1st edition, chap. xxv.).  He assigned an approximate date to the beginning of this captivity, “some months after the death of Cardinal Mazarin” (1661); he gave a description of the prisoner, who according to him was “young and dark-complexioned; his figure was above the middle height and well proportioned; his features were exceedingly handsome, and his bearing was noble.  When he spoke his voice inspired interest; he never complained of his lot, and gave no hint as to his rank.”  Nor was the mask forgotten:  “The part which covered the chin was furnished with steel springs, which allowed the prisoner to eat without uncovering his face.”  And, lastly, he fixed the date of the death of the nameless captive; who “was buried,” he says, “in 1704., by night, in the parish church of Saint-Paul.”

Voltaire’s narrative coincided with the account given in the ’Memoires de Peyse’, save for the omission of the incident which, according to the ‘Memoires’, led in the first instance to the imprisonment of Giafer.  “The prisoner,” says Voltaire, “was sent to the Iles Sainte-Marguerite, and afterwards to the Bastille, in charge of a trusty official; he wore his mask on the journey, and his escort had orders to shoot him if he took it off.  The Marquis de Louvois visited him while he was on the islands, and when speaking to him stood all the time in a respectful attitude.  The prisoner was removed to the Bastille in 1690, where he was lodged as comfortably as could be managed in that building; he was supplied with everything he asked for, especially with the finest linen and the costliest lace, in both of which his taste was perfect; he had a guitar to play on, his table was excellent, and the governor rarely sat in his presence.”

Voltaire added a few further details which had been given him by M. de Bernaville, the successor of M. de Saint-Mars, and by an old physician of the Bastille who had attended the prisoner whenever his health required a doctor, but who had never seen his face, although he had “often seen his tongue and his body.”  He also asserted that M. de Chamillart was the last minister who was in the secret, and that when his son-in-law, Marshal de la Feuillade, besought him on his knees, de Chamillart being on his deathbed, to tell him the name of the Man in the Iron Mask, the minister replied that he was under a solemn oath never to reveal the secret, it being an affair of state.  To all these details, which the marshal acknowledges to be correct, Voltaire adds a remarkable note:  “What increases our wonder is, that when the unknown captive was sent to the Iles Sainte-Marguerite no personage of note disappeared from the European stage.”