Columbia subject headings:
Holy Roman Empire--Politics and government--Charles V, 1519-1556.
Reformation--Holy Roman Empire.
Harvard subject headings:
Holy Roman Empire--Politics and government--16th century.
Reformation--16th century.
Reformation--Holy Roman Empire.
Princeton subject headings:
Church and state--Germany--History--16th century.
Germany--Church history--16th century.
Reformation--Germany.