Columbia subject headings:
Harvard subject headings:
Germany--History--Hohenstaufen, 1138-1254--Congresses.
Hohenstaufen, House of--Congresses.
Princeton subject headings:
Agnes, Margravine, consort of Leopold III, Saint, Margrave of Austria, 1072-1143--Congresses.
Austria--History--To 1273--Congresses.
Austria--Kings and rulers--Biography--Congresses.
Babenberg, House of--Congresses.
Hohenstaufen, House of--Congresses.
Holy Roman Empire--History--843-1273--Congresses.
Leopold III, Saint, Margrave of Austria, 1075-1136--Congresses.