Man in the Iron Mask in the mask. It has even been suggested that he was one of the other famous contemporary prisoners being held at Pignerol at the same time as Dauger. Voltaire claimed that the prisoner was a son of Anne of Austria and Cardinal Mazarin, and therefore an illegitimate half-brother of King Louis XIV. However, the sincerity of this claim is uncertain. In his history essay "Le Masque de fer", French novelist Marcel Pagnol, supporting his theory in particular on the circumstances of King Louis XIV's birth, claims that the Man in the Iron mask was indeed a twin but born second,
Man in the Iron Mask the enquiry the investigators were told about a supplier of poisons, a surgeon named "Auger", and Duvivier became convinced that Dauger de Cavoye, disinherited and short of money, had become Auger, the supplier of poisons, and subsequently Dauger, the man in the mask. In a letter sent by Louvois to Saint-Mars shortly after Fouquet's death while in prison (with Dauger acting as his valet), the minister adds a note in his own handwriting, asking how Dauger performed certain acts that Saint-Mars had mentioned in a previous correspondence (now lost) and "how he got the drugs necessary to do so". Duvivier