Columbia subject headings:
Mediterranean Region--History--476-1517--Congresses.
Sicily (Italy)--History.
Teutonic Knights--History--To 1500--Congresses.
Harvard subject headings:
Mediterranean Region--History--476-1517--Congresses.
Military religious orders--Italy--Sicily--History--Congresses.
Military religious orders--Mediterranean Region--History--Congresses.
Sicily (Italy)--Civilization--Congresses.
Teutonic Knights--History--Congresses.
Teutonic Knights--Italy--Sicily--Congresses.
Teutonic Knights--Mediterranean Region--Congresses.
Princeton subject headings: