Columbia subject headings:
Harvard subject headings:
Frederick II, Holy Roman Emperor, 1194-1250--Congresses.
Henry IV, Holy Roman Emperor, 1050-1106--Congresses.
Italy, Southern--Church history--To 1500--Congresses.
Monasteries and state--Italy, Southern--To 1500--Congresses.
Montevergine (Abbey)--Congresses.
Nobility--Italy, Southern--History--To 1500--Congresses.
Princeton subject headings:
Frederick II, Holy Roman Emperor, 1194-1250--Congresses.
Montevergine (Abbey)--History--Congresses.