Columbia subject headings:
Catholic Church--Bishops--History.
Catholic Church--Government--History.
Episcopacy--History of doctrines--Middle Ages, 600-1500.
Pastoral theology--Catholic Church--History--To 1500.
Harvard subject headings:
Catholic Church--Bishops--History--To 1500.
Catholic Church--Government--History--To 1500.
Princeton subject headings:
Catholic Church--Bishops--History.
Catholic Church--Government--History.
Episcopacy--History of doctrines--Middle Ages, 600-1500.
Pastoral theology--Catholic Church--History--To 1500.