Columbia subject headings:
Harvard subject headings:
Frederick II, Holy Roman Emperor, 1194-1250
Konrad IV, King of Germany, 1228-1254
Manfred, King of Naples and Sicily, approximately 1232-1266
Sicily (Italy)--History--1194-1282--Sources.
Princeton subject headings:
Frederick II, Holy Roman Emperor, 1194-1250.
Konrad IV, King of Germany, 1228-1254.
Manfred, King of Naples and Sicily, approximately 1232-1266.
Sicily (Italy)--History--1194-1282--Sources.