Columbia subject headings:
Byzantine Empire--History.
Marche (Italy)
Ravenna (Exarchate)--History.
Ravenna (Exarchate)--Social conditions.
Harvard subject headings:
Byzantine Empire--History.
Marche (Italy)
Ravenna (Exarchate)--History.
Ravenna (Exarchate)--Social conditions.
Princeton subject headings:
Byzantine Empire--History.
Marche (Italy)
Ravenna (Exarchate)--History.
Ravenna (Exarchate)--Social conditions.