One other change awaited the prisoner, the last before his final release. High preferment came to Saint Mars, who was offered and accepted the governorship of the Bastile. He was to bring his "ancient prisoner" with him to Paris; to make the long journey across France weighted with the terrible responsibility of conveying such a man safely in open arrest. We get a passing glimpse of the cortège in a letter published by the grandnephew of Saint Mars, M. Polteau, who describes the halt made for a night at Polteau, a country house belonging to Saint Mars.
"The Man in the Mask," he writes, in 1768, "came in a litter which preceded that of M. de Saint Mars. They were accompanied by several men on horseback. The peasants waited to greet their lord. M. de Saint Mars took his meals with his prisoner, who was placed with his back to the windows of the dining room which overlooked the courtyard. The peasants whom I questioned could not see whether he wore his mask while eating, but they took notice of the fact that M. de Saint Mars who sat opposite to him kept a pair of pistols beside his plate. They were waited on by one manservant who fetched the dishes from the anteroom where they were brought to him, taking care to close the door of the dining room after him. When the prisoner crossed the courtyard, he always wore the black mask. The peasants noticed that his teeth and lips showed through, also that he was tall and had white hair. M. de Saint Mars slept in a bed close to that of the masked man."
The prisoner arrived at the Bastile on the 18th of September, 1698, and the authentic record of his reception appears in the journal of the King's lieutenant of the castle, M. du Junca, still preserved in the Arsenal Library. "M. de Saint Mars, governor of the Chateau of the Bastile, presented, for the first time, coming from his government of the Isle of Sainte-Marguerite, bringing with him a prisoner who was formerly in his keeping at Pignerol." The entry goes on to say that the newcomer was taken to the third chamber of the Bertandière tower and lodged there alone in the charge of a gaoler who had come with him. He was nameless in the Bastile and was known only as "the prisoner from Provence" or "the ancient prisoner."