Columbia subject headings:
Kings and rulers--Duties.
Poland--Politics and government--To 1572.
Sigismund II Augustus, King of Poland, 1520-1572.
Harvard subject headings:
Poland--Politics and government--1520-1572.
Sigismund II Augustus, King of Poland, 1520-1572
Princeton subject headings:
Poland--Politics and government--1520-1572.
Sigismund II Augustus, King of Poland, 1520-1572.