Columbia subject headings:
Castello del Monte (Italy)
Castles--Italy--Puglia--History.
Frederick II, Holy Roman Emperor, 1194-1250.
Harvard subject headings:
Castello del Monte (Italy)
Castles--Italy--Puglia--History.
Frederick II, Holy Roman Emperor, 1194-1250.
Princeton subject headings:
Castello del Monte (Italy)
Castles--Italy--Puglia--History.
Fortification--Italy--Puglia--History.
Frederick II, Holy Roman Emperor, 1194-1250--Homes and haunts.
Military architecture--Italy--Puglia.
Puglia (Italy)--History--To 1500.