Columbia subject headings:
Catholic Church--Foreign relations--Holy Roman Empire.
Church and state--Holy Roman Empire.
Church history--11th century.
Gregory VII, Pope, approximately 1015-1085.
Henry IV, Holy Roman Emperor, 1050-1106.
Holy Roman Empire--Foreign relations--Catholic Church.
Holy Roman Empire--History--Henry IV, 1056-1106.
Investiture--History--To 1500.
Matilde, di Canossa, contessa, 1046-1115.
Harvard subject headings:
Catholic Church--Foreign relations--Holy Roman Empire.
Church and state--Holy Roman Empire
Church history--11th century
Gregory VII, Pope, approximately 1015-1085
Henry IV, Holy Roman Emperor, 1050-1106
Holy Roman Empire--Foreign relations--Catholic Church.
Holy Roman Empire--History--Henry IV, 1056-1106
Investiture--History--To 1500.
Matilde, di Canossa, contessa, 1046-1115
Princeton subject headings:
Catholic Church--Foreign relations--Holy Roman Empire.
Church and state--Holy Roman Empire.
Church history--11th century.
Gregory VII, Pope, approximately 1015-1085.
Henry IV, Holy Roman Emperor, 1050-1106.
Holy Roman Empire--Foreign relations--Catholic Church.
Holy Roman Empire--History--Henry IV, 1056-1106.
Investiture--History--To 1500.
Matilde, di Canossa, contessa, 1046-1115.