Columbia subject headings:
Harvard subject headings:
Church history--Middle Ages, 600-1500--Congresses.
Europe--Church history--600-1500--Congresses.
Europe--History--476-1492--Congresses.
Twelfth century--Congresses.
Princeton subject headings:
Civilization, Medieval--12th century--Congresses.
Europe--History--476-1492--Congresses.
Twelfth century--Congresses.