Columbia subject headings:
Eschatology--Congresses.
Harvard subject headings:
Civilization, Medieval--Congresses
Eschatology--History--To 1500--Congresses.
Europe--Church history--600-1500--Congresses.
Princeton subject headings:
Civilization, Medieval--Congresses.
Eschatology--History--To 1500--Congresses.
Europe--Church history--600-1500--Congresses.