Columbia subject headings:
Italy--Church history--476-1400.
Ravenna (Italy)--Church history.
Harvard subject headings:
Catholic Church. Archdiocese of Ravenna--History.
Church history--Middle Ages, 600-1500
Church property--Italy--Ravenna Region--Registers.
Italy--Church history--476-1400.
Ravenna (Italy)--Church history.
Princeton subject headings:
Ravenna Region(Italy)--Church history--Sources.