Columbia subject headings:
Bishops--Italy--History--To 1500.
Catholic Church--Bishops--History.
Catholic Church--Bishops--Italy--History.
Catholic Church--Italy--History.
Church history--Middle Ages, 600-1500.
Italy--Church history.
Harvard subject headings:
Bishops--Italy--History--To 1500.
Catholic Church--Italy--Bishops--History.
Italy--Church history.
Princeton subject headings:
Bishops--Italy--History--To 1500.
Catholic Church--Italy--Bishops--History.
Italy--Church history.