king of the Franks and Holy Roman Emperor
as Charles II he was Holy Roman Emperor and as Charles I he was king of France (823-877)
the title of the Holy Roman Emperors or the emperors of Austria or of Germany until 1918
the council of the Western Church in 1245 that excommunicated Holy Roman Emperor Frederick II and planned a new crusade against the Holy Land
Holy Roman Emperor Frederick II
[网络] 神圣罗马皇帝弗雷德里克二世
