Columbia subject headings:
Catholic Church--Foreign relations--Holy Roman Empire.
Celestine III, Pope, approximately 1106-1198.
Church history--12th century.
Clement III, Pope, -1191.
Holy Roman Empire--Foreign relations--Catholic Church.
Harvard subject headings:
Catholic Church--Foreign relations--Holy Roman Empire.
Celestine III, Pope, approximately 1106-1198.
Church history--12th century.
Clement III, Pope, -1191.
Holy Roman Empire--Foreign relations--Catholic Church.
Papacy--History--To 1309
Princeton subject headings:
Catholic Church--Foreign relations--Holy Roman Empire.
Celestine III, Pope, approximately 1106-1198.
Church history--12th century.
Clement III, Pope, -1191.
Holy Roman Empire--Foreign relations--Catholic Church.