Columbia subject headings:
Church history--Middle Ages, 600-1500--Congresses.
Eleventh century--Congresses.
Europe--Economic conditions--To 1492--Congresses.
Europe--History--476-1492--Congresses.
Harvard subject headings:
Church history--Middle Ages, 600-1500--Congresses.
Eleventh century--Congresses.
Europe--Economic conditions--To 1492--Congresses.
Europe--History--476-1492--Congresses.
Princeton subject headings:
Church history--Middle Ages, 600-1500--Congresses.
Eleventh century--Congresses.
Europe--Economic conditions--To 1492--Congresses.
Europe--History--476-1492--Congresses.