Columbia subject headings:
Church history--Middle Ages, 600-1500.
Europe--History--476-1492.
Military art and science--History.
Military history, Medieval.
Mongols--History.
Harvard subject headings:
Church history--Middle Ages, 600-1500
Europe--History--476-1492.
Military art and science--History
Military history, Medieval.
Mongols--History
Princeton subject headings: