Wolfram von Eschenbach nos informa que Kyot, "el famoso Maestro", trajo a suelo germano la verdadera leyenda del Graal desde la Provenza; y que Chrétien de Troyes (el autor del Parsifal galo, o el Conde del Graal) la modificó. Si bien es cierto que no existe poema épico alguno acerca del Graal escrito por "Kyot", sabemos que a finales del siglo XII un poeta francés de la Provenza de nombre Guyot recorría las cortes más renombradas del norte y sur de Francia; y que entre sus poemas se encontraba una "Biblia" en la que caricaturizaba a sus contemporáneos. Resulta posible atribuir a este Guyot una versión del Parsifal que jamás llegó a nuestras manos.

Si le Graal est un symbole phare — aussi mystérieux que fascinant — de la mythologie et de l’inconscient collectif européens, Croisade contre le Graal appartient à la famille — peu nombreuse — des ouvrages mythiques, des livres cultes. Depuis sa parution (1933 en Allemagne, 1934 en France), il a guidé des générations de rêveurs vers les cimes ariégeoises, en général, et le château de Montségur, en particulier. Régulièrement réédité des deux côtés du Rhin, il est régulièrement épuisé et recherché. Adversaires et partisans des thèses développées par Otto Rahn, tous s’accordent sur un point: Croisade contre le Graal a largement contribué à l’engouement touristique pour les Pyrénées cathares.

The Grail. Between 1190 and 1240, it formed the central theme of a series of literary works that spoke of, and appealed to, a new social class, that of the knights and warriors and the adventures they encountered on their travels. In recent decades, it unleashed Indiana Jones on one of his death-defying treasure hunts and was the central ingredient of Dan Brown’s The Da Vinci Code, one of the biggest bestselling novels ever.
For Richard Barber, in The Holy Grail: The History of a legend, “it is, in all its forms, a construct of the creative imagination”. However, for dozens of other authors, the Grail is not a literary invention, but a veritable treasure, out there, somewhere. Unfortunately, in general, studies trying to identify and trace the physical Grail have taken on flights of fancy. The Grail has been linked with countries from the Middle East to America, as well as with the persecuted Cathars and even extra-terrestrial beings. It has been labelled a code word for the Ark of the Covenant, after the Templars allegedly transported it from the Middle East to a new hiding place in France.

In the early 20th century, a series of palm leaves, containing anomalous writing, were apparently discovered within a hidden cache of the walls of the Cathar castle of Montségur. Though without any intrinsic value, the “wooden book” – as it became known – would become the centrepiece of the esoteric and metaphysical community; its discoverers even labelled it “the Oracle” and said it was able to contact the hidden masters of Agharta.

Montségur is seen as the final stronghold of the Cathar faith, a bastion of true devotion besieged by the worldly ambitions of the papal troops. In March 1244, the Cathars that had been locked inside the castle for months finally surrendered; approximately 220 were burned en masse in a bonfire at the foot of the pog when they refused to renounce their convictions.