French aristocrat, the Marquis de Cherisey. Claimed to be of Merovingian decent, and together with Pierre Plantard was behind the 20th century revival of the Priory of Sion.

Evidence suggests that the Sauniere Documents, supposedly found by Berenger Sauniere in 1891, are in fact forgeries made by de Cherisey in the mid-50's. As many authors have used these documents as evidence, this deals a severe blow to the Priory of Sion / Rennes-le-Chateau conspiracy theory.