Columbia subject headings:
Europe--Social conditions--To 1492.
Social history--Medieval, 500-1500.
Social institutions--History.
Harvard subject headings:
Civilization, Medieval--Congresses
Europe--Civilization--Congresses.
Middle Ages--Congresses
Renaissance--Congresses
Princeton subject headings:
Civilization, Medieval--Congresses.
Europe--Civilization--Congresses.
Middle Ages--Congresses.
Renaissance--Congresses.