Columbia subject headings:
Catholic Church--Foreign relations--Holy Roman Empire.
Church and state.
Church history--Middle Ages, 600-1500.
Gregory VII, Pope, approximately 1015-1085.
Henry IV, Holy Roman Emperor, 1050-1106.
Holy Roman Empire--Foreign relations--Catholic Church.
Harvard subject headings:
Catholic Church--Foreign relations--Holy Roman Empire.
Church and state
Church history--Middle Ages, 600-1500
Gregory VII, Pope, approximately 1015-1085
Henry IV, Holy Roman Emperor, 1050-1106.
Holy Roman Empire--Foreign relations--Catholic Church.
Princeton subject headings:
Catholic Church--Foreign relations--Holy Roman Empire.
Church and state.
Church history--Middle Ages.
Gregory VII, Pope, approximately 1015-1085.
Henry IV, Holy Roman Emperor, 1050-1106.
Holy Roman Empire--Foreign relations--Catholic Church.