Columbia subject headings:
Aristocracy (Social class)--Europe--History.
Hierarchies--Europe--History.
Rural population--Europe--History.
Harvard subject headings:
Aristocracy (Social class)--Europe--History--Congresses.
Europe--History--Congresses.
Europe--Politics and government--Congresses.
Nobility--Europe--History--Congresses.
Nobility--Political activity--Europe--History--Congresses.
Princeton subject headings: