Columbia subject headings:
Nobility--Czech Republic--Bohemia--History--Congresses.
Nobility--Germany--History--Congresses.
Nobility--Poland--History--Congresses.
Harvard subject headings:
Nobility--Europe--History--To 1500.
Social history--Medieval, 500-1500
Princeton subject headings:
Nobility--Czech Republic--Bohemia--History--Congresses.
Nobility--Germany--History--Congresses.
Nobility--Poland--History--Congresses.