Columbia subject headings:
Harvard subject headings:
Black Sea Region--Commerce--History.
Byzantine Empire--Relations--Italy--Genoa.
Europe--Commerce--History.
Genoa (Italy)--1339-1528.
Genoa (Italy)--Relations--Byzantine Empire.
Genoa (Italy)--To 1339.
Princeton subject headings:
Black Sea Region--History.
Byzantine Empire--Relations--Italy--Genoa.
Genoa (Italy)--Relations--Byzantine Empire.