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In page Catharism:

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The publication of the early pseudo-scholarly book Crusade Against the Grail, by the young German and later SS officer, Otto Rahn in the 1930s, rekindled interest in the connection between the Cathars and the Holy Grail, especially in Germany. Rahn was convinced that the 13th-century work Parzival by Wolfram von Eschenbach was a veiled account of the Cathars.[citation needed] The philosopher and Nazi government official Alfred Rosenberg speaks favourably of the Cathars in The Myth of the Twentieth Century.[1]