1246年腓特烈二世公爵死后，男系绝嗣，家族的势力迅速没落。
With the death of Duke Frederick II in1246 , the male line ended , and the family 's power declined rapidly .
但在皇帝腓特烈二世（frederickii）于1250年去世后，由于没有一致的继承人，也就没有了监管者。
But when the Emperor Frederick III died in 1250 there was no agreed successor , and hence no regulator .
腓特烈二世腓特烈二世腓特烈二世