The Dossiers Secrets asserted that the Priory of Sion and the Knights Templar always shared the same Grand Master until a schism occurred during the "Cutting of the elm" incident in 1188.
"IN THE DOSSIERS secrets, the following individuals are listed as successive Grand Masters of the Prieure de Sion - or, to use the official term,
'Nautonnier', an old French word which means 'navigator' or 'helmsman':
Jean de Gisors 1188-1220
Marie de Saint-Clair 1220-66
Guillaume de Gisors 1266-1307
Edouard de Bar 1307-36
Jeanne de Bar 1336-51
Jean de Saint-Clair 1351-66
Blanche d'Evreux 1366-98
Nicolas Flamel 1398-1418
Rene d'Anjou 1418-80
Iolande de Bar 1480-83
Sandro Filipepi 1483-1510
Leonard de Vinci 1510-19
Connetable de Bourbon 1519-27
Ferdinand de Gonzague 1527-75
Louis de Nevers 1575-95
Robert Fludd 1595-1637
J. Valentin Andrea 1637-54
Robert Boyle 1654-91
Isaac Newton 1691-1727
Charles Radclyffe 1727-46
Charles de Lorraine 1746-80
Maximilian de Lorraine 1780-1801
Charles Nodier 1801-44
Victor Hugo 1844-85
Claude Debussy 1885-1918
Jean Cocteau 1918- " - The Holy Blood and the Holy Grail Michael Baigent, Richard Leigh and Henry Lincoln Pg. 114-115
"Most of the names on the list were either allied by blood to the house of Lorraine or associated with it in some other fashion"- The Holy Blood and the Holy Grail Michael Baigent, Richard Leigh and Henry Lincoln Pg. 118-119
"According to the 'Prieure documents', every Grand Master, on assuming his position, has adopted the name of Jean (John) - or, since there were four women, Jeanne (Joan). Sion's Grand Masters are therefore alleged to have comprised a continuous succession of Jeans and Jeannes, from 1188 to the present. This succession was clearly intended to imply an esoteric and Hermetic papacy based on John, in contrast (and perhaps opposition) to the exoteric one based on Peter." - The Holy Blood and the Holy Grail Michael Baigent, Richard Leigh and Henry Lincoln Pg. 140