Sainte-Foix hastened to reply, upholding the soundness of the views he had advanced.  He procured from Arras a copy of an entry in the registers of the Cathedral Chapter, stating that Louis XIV had written with his own hand to the said Chapter that they were to admit to burial the body of the Comte de Vermandois, who had died in the city of Courtrai; that he desired that the deceased should be interred in the centre of the choir, in the vault in which lay the remains of Elisabeth, Comtesse de Vermandois, wife of Philip of Alsace, Comte de Flanders, who had died in 1182.  It is not to be supposed that Louis XIV would have chosen a family vault in which to bury a log of wood.

Sainte-Foix was, however, not acquainted with the letter of Barbezieux, dated the 13th August 1691, to which we have already referred, as a proof that the prisoner was not the Comte de Vermandois; it is equally a proof that he was not the Duke of Monmouth, as Sainte-Foix maintained; for sentence was passed on the Duke of Monmouth in 1685, so that it could not be of him either that Barbezieux wrote in 1691, “The prisoner whom you have had in charge for twenty years.”

In the very year in which Sainte-Foix began to flatter himself that his theory was successfully established, Baron Heiss brought a new one forward, in a letter dated “Phalsburg, 28th June 1770,” and addressed to the ‘Journal Enclycopedique’.  It was accompanied by a letter translated from the Italian which appeared in the ‘Histoire Abregee de l’Europe’ by Jacques Bernard, published by Claude Jordan, Leyden, 1685-87, in detached sheets.  This letter stated (August 1687, article ‘Mantoue’) that the Duke of Mantua being desirous to sell his capital, Casale, to the King of France, had been dissuaded therefrom by his secretary, and induced to join the other princes of Italy in their endeavours to thwart the ambitious schemes of Louis XVI.  The Marquis d’Arcy, French ambassador to the court of Savoy, having been informed of the secretary’s influence, distinguished him by all kinds of civilities, asked him frequently to table, and at last invited him to join a large hunting party two or three leagues outside Turin.  They set out together, but at a short distance from the city were surrounded by a dozen horsemen, who carried off the secretary, ‘disguised him, put a mask on him, and took him to Pignerol.’  He was not kept long in this fortress, as it was ’too near the Italian frontier, and although he was carefully guarded it was feared that the walls would speak’; so he was transferred to the Iles Sainte-Marguerite, where he is at present in the custody of M. de Saint-Mars.

This theory, of which much was heard later, did not at first excite much attention.  What is certain is that the Duke of Mantua’s secretary, by name Matthioli, was arrested in 1679 through the agency of Abbe d’Estrade and M. de Catinat, and taken with the utmost secrecy to Pignerol, where he was imprisoned and placed in charge of M. de Saint-Mars.  He must not, however, be confounded with the Man in the Iron Mask.