Reichsführer-SS was a special SS rank that existed between the years of 1925 and 1945. Reichsführer-SS was a title from 1925 to 1933 and, after 1934, became the highest rank of the German Schutzstaffel (SS). In 1934, Himmler's title became an actual rank after the Night of the Long Knives. From that point on, Reichsführer-SS became the highest rank of the SS and was considered the equivalent of a Generalfeldmarschall in the German Army. There was never more than one Reichsführer-SS in the SS, with Himmler holding the rank as his personal title and rank from 1934 to 1945.