and surrealism can be identified within his activities relating to the Priory of Sion hoax, Gisors and Rennes-le-Château, contained in his correspondence as well as in his documents that he deposited in the Bibliothèque nationale de France in Paris. Parchments During the early 1960s, de Chérisey forged two parchments, photocopies of which appeared in the 1967 book L'Or de Rennes by Gérard de Sède. De Sède's book adapted Corbu's story to fit-in with Plantard's claims about the Priory of Sion. The parchments hinted at the survival of the line of the Frankish king Dagobert II, that Plantard claimed to be descended from, as well as attempting to verify the existence of the 1000-year-old secret society, the Priory of Sion. The two parchments were later used as source material for the 1982 book The Holy Blood and the Holy Grail, which was itself used as a primary source for the 2003 bestselling novel The Da Vinci Code. Other documents, containing fake genealogies, were planted in the French National Library, the Bibliothèque Nationale in Paris throughout the 1960s, 1970s and 1980s. Pierre Plantard and Gérard de Sède fell out over book royalties when L'Or de Rennes was published in 1967, at the same time Philippe de Chérisey announced that he had forged the parchments. De Chérisey elaborated about this in his 1978 unpublished document L'Énigme de Rennes, claiming they were originally made for his friend Francis Blanche, as material for a French radio serial entitled Signé Furax. A second document by de Chérisey entitled Pierre et papier ("Stone and Paper") provides a more detailed explanation, giving the more complicated decoding technique to one of the parchments by using a Knight's Tour 25-letter alphabet, omitting the letter "w", the knowledge of which can only be known to the forger. An English translation of this document, together with a reproduction of the original, was published by Jean-Luc Chaumeil in 2010. Details of the forgeries The text of parchment I was copied from Codex Bezae, an Old Latin/Greek diglot from the 5th century CE contained in the book by Fulcran Grégoire Vigouroux, Dictionnaire De La Bible (1895). Philippe de Chérisey's reason for copying the passage from the Codex Bezae was his interest in the phrase "In Sabbato Secundo Primo", also found in the Gospel of Luke 6:1. Philippe de Chérisey stated: "This phrase has given headaches to the anonymous (secret) societies. It has to be