Columbia subject headings:
Church and state--History--Congresses.
Church history--Middle Ages, 600-1500--Congresses.
Conciliar theory--Congresses.
Harvard subject headings:
Catholic Church--Government--History--Congresses.
Conciliar theory--History--Congresses.
Princeton subject headings:
Church and state--History--Congresses.
Church history--Middle Ages, 600-1500--Congresses.
Conciliar theory--Congresses.