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