Columbia subject headings:
Harvard subject headings:
Church and state--Europe--History--To 1500.
Europe--History--476-1492.
Holy Roman Empire--Church history.
Holy Roman Empire--History--To 1517.
Holy Roman Empire--Kings and rulers--Religious aspects.
Papacy--History
Popes--Temporal power--History--To 1500.
Princeton subject headings:
Church and state--History--To 1500.
Holy Roman Empire--Church history.
Holy Roman Empire--History--To 1517.
Holy Roman Empire--Kings and rulers--Religious aspects.
Papacy--History.
Popes--Temporal power--History--To 1500.