Columbia subject headings:
Harvard subject headings:
Church and state--Holy Roman Empire--History--Congresses.
Hohenstaufen, House of--Congresses.
Holy Roman Empire--History--Hohenstaufen, 1138-1254--Congresses.
Papacy--History--To 1309--Congresses.
Princeton subject headings:
Church and state--Holy Roman Empire--History--Congresses.
Hohenstaufen, House of--Congresses.
Holy Roman Empire--History--Hohenstaufen, 1138-1254--Congresses.
Papacy--History--To 1309--Congresses.