Columbia subject headings:
Christian life--History--Middle Ages, 600-1500.
Church history--Middle Ages, 600-1500.
Europe--Church history--600-1500.
Harvard subject headings:
Church history--Middle Ages, 600-1500
Princeton subject headings:
Christian life--History--Middle Ages, 600-1500.
Church history--Middle Ages, 600-1500.
Europe--Church history--600-1500.