Columbia subject headings:
Harvard subject headings:
Hohenstaufen, House of.
Holy Roman Empire--History--Hohenstaufen, 1138-1254.
Sicily (Italy)--History--1194-1282
Princeton subject headings:
Hohenstaufen, House of--Congresses.
Holy Roman Empire--History--Hohenstaufen, 1138-1254--Congresses.
Sicily (Italy)--History--1194-1282--Congresses.