Gérard Anaclet Vincent Encausse, whose esoteric pseudonyms were Papus and Tau Vincent, was a French physician, hypnotist, and popularizer of occultism, who founded the modern Martinist Order.

Joseph Alexandre Saint-Yves, Marquis d’Alveydre was a French occultist who adapted the works of Fabre d'Olivet and, in turn, had his ideas adapted by Gérard Encausse alias Papus. His work on L'Archéom