Columbia subject headings:
Byzantine Empire--Civilization.
China--Relations--Europe.
Europe--Relations--China.
Geography, Medieval--Congresses.
Islamic civilization.
Literature, Medieval--History and criticism.
Rome--Civilization.
Harvard subject headings:
Byzantine Empire--Civilization--Congresses.
Fourteenth century--Congresses.
Geography, Medieval--Congresses.
Rome--Civilization.--Congresses.
Thirteenth century--Congresses.
Princeton subject headings:
Byzantine Empire--Civilization.
China--Relations--Europe.
Europe--Relations--China.
Geography, Medieval--Congresses.
Islamic civilization.
Literature, Medieval--History and criticism.
Rome--Civilization.