Columbia subject headings:
Harvard subject headings:
Church and state--Holy Roman Empire
Gregory VII, Pope, approximately 1015-1085
Henry IV, Holy Roman Emperor, 1050-1106
Princeton subject headings:
Catholic Church--Relations--Holy Roman Empire.
Germany--History--Henry IV, 1056-1106.
Gregory VII, Pope, approximately 1015-1085.
Henry IV, Holy Roman Emperor, 1050-1106.
Holy Roman Empire--Foreign relations--Catholic Church.