Columbia subject headings:
Catholic Church--Benefices--Poland.
Civilization, Medieval.
Poland--Kings and rulers.
Poland--Politics and government--To 1572.
Harvard subject headings:
Church and state--Poland.
Poland--History--Piast period, 960-1386
Poland--Politics and government--To 1572
Political culture--Poland.
Princeton subject headings:
Catholic Church--Poland--Benefices.
Poland--Kings and rulers.
Poland--Politics and government--To 1572.