Columbia subject headings:
Avars.
Byzantine Empire--History--527-1081.
Commerce--History--Medieval, 500-1500.
Europe, Eastern--Antiquities.
Harvard subject headings:
Avars.
Byzantine Empire--History--527-1081.
Commerce--History--Medieval, 500-1500
Europe, Eastern--Antiquities.
Princeton subject headings:
Avars.
Byzantine Empire--History--527-1081.
Europe, Eastern--Antiquities.