Some interesting facts: Balzac's Unknown Masterpiece is about a secret known to only two painters, Poussin and Pourbus; and appears to have been the inspiration for an occult masterpiece by Picasso. "Croise" Andre Malraux appears to have been part of an aerial expedition to discover the palace of the Queen of Sheba in Yemen, a feat which he was congratulated for by Haile Selassie of Ethiopia; as Minister of Cultural Affairs, he helped organize an archaeological expedition to Gisors in 1964. Leblanc's work The Triangle of Gold has the same name as a "prieure document" created by Jean-Luc Chaumeil in 1979. Satie left a strange note behind saying he was part of a society descended from the Knights Templar and the Protectors of the Holy Sepulchre. Barres' most famous work is La Colline Inspiree, about Sion-Vaudemont and the Baillard Brothers. In one of de Nerval's works, he said that he saw a star rising from the sea, and written on it was the name "Merovee".
Henry Lincoln first pointed out that Cocteau's Mural in Notre Dame de France seems to have a pentagram centered on Cocteau's forehead. My research suggests that this pentagram is a reference to Cocteau's surrealist colleagues, Guillaume Apollinaire, who had a star-shaped wound on his head, and Raymond Roussel, who wrote a play, The Star in the Forehead. The Mural also contains a Blue Rose, which is an apparent allusion to a Russian Symbolist art group that influenced Marc Chagall and other painters. According to Simon Miles, the Surrealist poem Le Serpent Rouge contains symbolism from Jung's _Mysterium Coniunctionis_, which was of key interest to Surrealists. Most importantly, Gerard de Sede in the 1940s belonged to two Surrealist groups, Les Reverberes and La Main a Plume. Members of these groups would go on later to form the Workshop for Potential Literature (Oulipo) in the 1960s. Oulipo was interested in cryptograms, ciphers, textual reversals and inversions, geometric figures in paintings (Oupeinpo), and one key Oulipo text even used the Knight's Tour of the Chessboard as a organizing device. Jean-Pierre Deloux seems to be connected to Oupolipo, the offshoot of Oulipo devoted to creating detective police fictions. And Philippe de Cherisey seems to have written several articles on Alfred Jarry, the founder of the Surrealist College de Pataphysique.