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