Columbia subject headings:
Frederick II, Holy Roman Emperor, 1194-1250.
Occultism--Holy Roman Empire--History.
Harvard subject headings:
Frederick II, Holy Roman Emperor, 1194-1250.
Occultism--Holy Roman Empire--History.
Princeton subject headings:
Frederick II, Holy Roman Emperor, 1194-1250.
Holy Roman Empire--History--Frederick II, 1215-1250.
Naples (Kingdom)--History--1016-1268.
Occultism--Holy Roman Empire--History.
Occultism--Italy--Sicily--History.
Occultism--Naples (Kingdom)--History.
Sicily (Italy)--History--1194-1282.