In 1931 Hitler ordered the "Schutzstaffel" (SS) to investigate the alleged rumors regarding his ancestry; they found no evidence of any Jewish ancestors. Hitler then ordered a genealogist by the name of Rudolf Koppensteiner to publish a large illustrated genealogical tree showing his ancestry. This was published in the book "Die Ahnentafel des Fuehrers" ("The pedigree of the Leader") in 1937, which concluded that Hitler's family were all Austrian Germans with no Jewish ancestry and that Hitler had an unblemished "Aryan" pedigree. As Alois himself legitimized Johann Georg Hiedler as his biological father (with three witnesses affirming and watching this) and the priest changed the father's blank space on the birth certificate in 1876, this was considered certified proof for Hitler's ancestry, thus Hitler "was" considered an "Aryan".