Columbia subject headings:
Harvard subject headings:
Byzantine Empire--Historiography--Congresses.
Historiography--Congresses
Middle Ages--Historiography--Congresses
Rome--Historiography--Congresses.
Princeton subject headings:
Byzantine Empire--Historiography--Congresses.
Historiography--Congresses.
Middle Ages--Historiography--Congresses.
Rome--Historiography--Congresses.