Columbia subject headings:
Harvard subject headings:
Civilization, Ancient--Congresses
Cultural relations--Congresses.
Culture diffusion--Eurasia--History--Congresses.
Eurasia--Commerce--History--Congresses.
International relations--History--To 1500--Congresses.
Transnationalism--History--Congresses.
Princeton subject headings:
Civilization, Ancient--Political aspects--Congresses.
International relations--History--To 1500--Congresses.