The book "L'Or de Rennes" by Gérard de Sède (with the unpublicised collaboration of Pierre Plantard) contained elements relating to the fictitious secret society the Priory of Sion, reproducing "parchments" that alluded to the survival of the Merovingian line of Frankish kings from Dagobert II, and Pierre Plantard claimed to be descended from that monarch. Pierre Plantard and Gérard de Sède fell out over book royalties when "L'Or de Rennes" was published in 1967 and Plantard's friend Philippe de Chérisey revealed that he fabricated the parchments.