Columbia subject headings:
Civilization, Greco-Roman--Congresses.
Civilization, Medieval--Congresses.
Europe--History--392-814--Congresses.
Europe--History--To 476--Congresses.
Harvard subject headings:
Civilization, Greco-Roman--Congresses
Civilization, Medieval--Congresses
Europe--History--392-814--Congresses.
Europe--History--476-1492--Congresses.
Europe--History--To 476--Congresses.
History, Ancient--Congresses
History--Periodization--Congresses.
Middle Ages--Congresses
Princeton subject headings:
Europe--History--476-1492--Congresses.
History, Ancient--Congresses.
History--Periodization--Congresses.
Middle Ages--Congresses.