Columbia subject headings:
Harvard subject headings:
Antipopes--History--To 1500--Congresses.
Authority--Religious aspects--Catholic Church--Congresses.
Church history--Middle Ages, 600-1500--Congresses.
Papacy--History--To 1500--Congresses.
Popes--Primacy--History--To 1500--Congresses.
Princeton subject headings:
Antipopes--Congresses.
Church history--Middle Ages, 600-1500--Congresses.
Papacy--History--Congresses.
Popes--Primacy--Congresses.
Schism, The Great Western, 1378-1417--Congresses.