Columbia subject headings:
Church and state--History.
Papacy--History--To 1309.
Popes--Temporal power.
Harvard subject headings:
Church and state--History
Church history--Middle Ages, 600-1500
Papacy--History
Papacy--History--To 1309
Popes--Temporal power
Princeton subject headings:
Church and state--History.
Church history--Middle Ages, 600-1500.
Papacy--History--To 1309.
Popes--Temporal power.