Columbia subject headings:
Europe--Kings and rulers--To 1500--Congresses.
Nobility--Europe--History--To 1500--Congresses.
Queens--Europe--History--To 1500--Congresses.
Harvard subject headings:
Europe--Kings and rulers--History--To 1500--Congresses.
Nobility--Europe--History--To 1500--Congresses.
Queens--Europe--History--To 1500--Congresses.
Women--Europe--History--To 1500--Congresses.
Princeton subject headings:
Europe--Kings and rulers--History--To 1500--Congresses.
Nobility--Europe--History--To 1500--Congresses.
Queens--Europe--History--To 1500--Congresses.
Women--Europe--History--To 1500--Congresses.