Columbia subject headings:
Christian civilization--To 1500--Congresses.
Christianity and culture--History--Middle Ages, 600-1500--Congresses.
Christianity and other religions--To 1500--Congresses.
Church and the world--History of doctrines--Middle Ages, 600-1500--Congresses.
Religion and sociology--Congresses.
Harvard subject headings:
Church and the world--Congresses
Church history--Middle Ages, 600-1500--Congresses
Religiousness--Congresses.
Princeton subject headings:
Christian civilization--To 1500--Congresses.
Christianity and culture--History--Middle Ages, 600-1500--Congresses.
Christianity and other religions--To 1500--Congresses.
Church and the world--History of doctrines--Middle Ages, 600-1500--Congresses.
Religion and sociology--Congresses.