From the moment of his arrest Matthioly received the fictitious name of Lestang, as a despatch of Catinat’s clearly shows.[548] He was sometimes designated by his right name, sometimes by this fictitious one. A letter from Louvois, August 16, 1680, authorises Saint-Mars “to place the Sieur de Lestang with the Jacobin, so as to avoid any intercourse between two priests;” and Saint-Mars’ reply, dated September 7, 1680, shows that Matthioly was confined with the Jacobin monk in the lower tower. In this letter Saint-Mars informs the Minister that Matthioly at first thought that he had been placed with a spy charged to watch him and give an account of his conduct. But the monk, a prisoner since several years, had become mad, of which Matthioly was soon convinced “by seeing him one day get out of bed stark naked and preach, as well as he could, without rhyme or reason.” The same letter shows Saint-Mars to us just as we have always known him, and watching through a hole over the door what his prisoners were doing.[549] On May 12, 1681, Louvois, when announcing to Saint-Mars his nomination to the governorship of Exiles, rendered vacant by the death of the Duke de Lesdiguières, “orders him to take with him _the two prisoners of the lower Tower_.” According to Roux-Fazillac, Delort, and all those who have occupied themselves with this question, these two prisoners are undoubtedly Matthioly and the Jacobin monk. On January 20, 1687, Saint-Mars, whose health had been affected by the rigorous climate of Exiles, was appointed to the governorship of the Isles Saint-Honorat and Sainte-Marguerite in the sea of Provence. He took with him one prisoner only. Reth and Delort do not hesitate to admit that, of the two prisoners in question, he who was taken by Saint-Mars to the Isles Sainte-Marguerite was Matthioly. Though unable to furnish a sure proof of it, they have no doubt. Roux-Fazillac, more circumspect and less positive, contents himself with remarking that either the Jacobin monk or Matthioly was the Man with the Iron Mask; and it is by means of general considerations, by proofs drawn from the mysterious manner in which the abduction had been accomplished, from Louis XIV.’s evident interest in concealing such a violation of international law, that Roux-Fazillac endeavours to prove Matthioly’s identity with the Iron Mask.