Columbia subject headings:
Church and state--History.
Church history--Middle Ages, 600-1500.
Ecclesiastical law--History.
Fuhrmann, Horst.
Papacy--History--To 1309.
Harvard subject headings:
Church history--Middle Ages, 600-1500
Ecclesiastical law--History.
Princeton subject headings:
Church history--Middle Ages, 600-1500.
Ecclesiastical law--History.
Fuhrmann, Horst.