Columbia subject headings:
Civilization, Medieval--Congresses.
Illusion in literature--Congresses.
Literature, Medieval--History and criticism--Congresses.
Magic in literature--Congresses.
Magic--Europe--History--Congresses.
Harvard subject headings:
Civilization, Medieval--Congresses
Magic--History--To 1500--Congresses.
Princeton subject headings:
Hallucinations and illusions--History--To 1500--Congresses.
Magic--History--To 1500--Congresses.