When Wilhelm realised that Hitler had no intention of restoring the monarchy, their relationship cooled. Upon his father's death in 1941, Wilhelm succeeded him as head of the House of Hohenzollern, the former German imperial dynasty. He was approached by those in the military and the diplomatic service who wanted to replace Hitler, but Wilhelm turned them down. After the ill-fated assassination attempt on 20 July 1944, Hitler nevertheless had Wilhelm placed under supervision by the "Gestapo" and had his home at Cecilienhof watched.