This paper is a survey of the biography of Scheubner-Richter, a Baltic-German from Riga, who later became a German cititzen and a wealthy nobleman by marriage. Because of his good knowledge of Russian he was engaged in a secret mission against Russia presumably by the military intellience service and in 1915 appointed German Vice-Consul of the Turkish city of Erzerum. There he became an important eye-witness to the Armenian genocide. He by helped many Armenians, who were threatened by deportation and murder. After being recalled in 1916 he fought in the German army on the East front, which occupied Riga. Mainly as a result of his bad experience with Bolshevism there he joined nationalist and anti-Bolshevik groups in Germany. He was a member of the circle around General Ludendorff and in very close contact with Russian ?White? emigrants. In 1921 he became a member of the NSDAP and in 1922 Hitlers probably closest and most important advisor. Besides he was important as a fund-raiser for the early NSDAP. In historical literature he is partly held responsible for plotting the ?Hitlerputsch? of 1923 in Munich, during which he was killed by a policeman?s bullett.This paper also deals with Ernst Nolte?s theory of the ?causal nexus?, in which Scheubner?s role as an eye-witness to the Armenian genocide, his experiences with the Bolsheviks and his function as Hitler?s advisor was used as argumentative starting point ? a theory, which started the famous ?Historikerstreit? in Germany?s nineteen-eighties. In addition, the paper tries to dare a comparison between Scheubners and Hitlers radicalism concerning antisemitism. As sources I have mainly used secondary literature and memoirs as well as articles from WAK, Scheubner?s most important journalistic organ.