Columbia subject headings:
Harvard subject headings:
Germany--History--843-1273--Congresses.
Guelf, House of--Congresses.
Hohenstaufen, House of--Congresses.
Oberschwaben (Germany)--History--Congresses.
Princeton subject headings:
Guelf, House of--Congresses.
Hohenstaufen, House of--Congresses.
Holy Roman Empire--History--Hohenstaufen, 1138-1254--Congresses.
Oberschwaben (Germany)--History--To 1500--Congresses.
Oberschwaben (Germany)--Kings and rulers--To 1500--Congresses.