Nicolas Fouquet to visit him only once, in 1679. The former minister bore his imprisonment with fortitude and composed several translations and devotionals in prison. According to official records, Fouquet died in Pinerolo on 23 March 1680. A year after his death, his remains were moved from Pinerolo to the family crypt in the Église Sainte-Marie-des-Anges in Paris. Fouquet's story is often entwined with that of the Man in the Iron Mask, who is often identified as the true king or even as an identical twin brother of Louis XIV. As such, he is a pivotal character in Alexandre Dumas' novel "The
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