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In page Affair of the Poisons:

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Also involved in the scandal was Eustache Dauger de Cavoye, the eldest living scion of a prominent noble family. Cavoye was disinherited by his family when, in an act of debauchery, he chose to celebrate Good Friday with a black mass. Upon his disinheritance, he opened a lucrative trade in "inheritance powders" and aphrodisiacs. He mysteriously disappeared after the abrupt ending of Louis's official investigation in 1678. Because of this and his name, he was once suspected of being the Man in the Iron Mask. However, this theory has fallen out of favour because it is now known that he was imprisoned by his family in 1679 in the Prison Saint-Lazare.[citation needed]