From the letter of Louvois to Fouquet, about Dauger (December 23, 1678), it is plain that Louis XIV. had no more pressing anxiety, nine years after Dauger’s arrest, than to conceal WHAT IT WAS THAT DAUGER HAD DONE. It is apparent that Saint-Mars himself either was unacquainted with this secret, or was supposed by Louvois and the King to be unaware of it. He had been ordered never to allow Dauger to tell him: he was not allowed to see the letters on the subject between Louvois and Fouquet. We still do not know, and never shall know, whether Dauger himself knew his own secret, or whether (as he had anticipated) he was locked up for not divulging what he did not know. The answer of Fouquet to Louvois must have satisfied Louis that Dauger had not imparted his secret to the other valet, La Riviere, for Fouquet was now allowed a great deal of liberty. In 1679, he might see his family, the officers of the garrison, and Lauzun--it being provided that Lauzun and Dauger should never meet. In March 1680, Fouquet died, and henceforth the two valets were most rigorously guarded; Dauger, because he was supposed to know something; La Riviere, because Dauger might have imparted the real or fancied secret to him. We shall return to these poor serving-men, but here it is necessary to state that, ten months before the death of their master, Fouquet, an important new captive had been brought to the prison of Pignerol. This captive was the other candidate for the honours of the Mask, Count Mattioli, the secretary of the Duke of Mantua. He was kidnapped on Italian soil on May 2, 1679, and hurried to the mountain fortress of Pignerol, then on French ground. His offence was the betraying of the secret negotiations for the cession of the town and fortress of Casal, by the Duke of Mantua, to Louis XIV. The disappearance of Mattioli was, of course, known to the world. The cause of his enlevement, and the place of his captivity, Pignerol, were matters of newspaper comment at least as early as 1687. Still earlier, in 1682, the story of Mattioli’s arrest and seclusion in Pignerol had been published in a work named ‘La Prudenza Trionfante di Casale.’* There was thus no mystery, at the time, about Mattioli; his crime and punishment were perfectly well known to students of politics. He has been regarded as the mysterious Man in the Iron Mask, but, for years after his arrest, he was the least mysterious of State prisoners. *Brentano, op. cit. p. 117.