Otto Rahn (1904 - 1939), writer and German Archeologist, was born on February 18th, 1904 from Charles and Clara Rahn, in Michelstadt in the Odenwald. He is the author of two dedicated works to the legend of the Graal and the crusade against the Albigensian, Croisade against Graal (1933) and the Court of Lucifer (1937).

Rahn carried out several forwardings in the Ariège French where he hoped to prove the historical veracity of the legend of Parsifal of Wolfram von Eschenbach and thus to find Graal, of which he believed being a pagan symbol. It met there inter alia Antonin Gadal, Maurice Magre, Déodat Roché and the Comtesse of Pujol-Murat. The success of its first work had drawn the attention of Heinrich Himmler, which was interested in the topics esoteric S. Rahn entered the Schutzstaffel (S) as archeologist in 1934 to be able to carry out its research on the Catharisme. In 1939, he was denounced for his Homosexualité and resigned of the organization. He was found died frozen in 1939 on the glacier of the Empereur sauvage.
" The thesis of Otto Rahn essentially consisted in comparing the Château of Montségur to Montsalvage, the legendary castle of Graal, for etymological reasons.

It is generally admitted that Otto Rahn was the model of the character of Indiana Jones in films of Steven Spielberg.