Columbia subject headings:
Christian sociology--History--Middle Ages, 600-1500.
Church history--Middle Ages, 600-1500.
Philosophy, Medieval.
Social conflict--Europe--History--To 1500.
Social conflict--Religious aspects--Christianity--History--To 1500.
Social conflict--Religious aspects--History--To 1500.
Harvard subject headings:
Church history--Middle Ages, 600-1500
Social conflict--Europe--History--To 1500.
Social conflict--Religious aspects--History--To 1500.
Princeton subject headings: