Columbia subject headings:
Boniface VIII, Pope, -1303--Congresses.
Celestine V, Pope, 1215-1296--Congresses.
Church history--Middle Ages, 600-1500--Congresses.
Papacy--History--To 1309--Congresses.
Harvard subject headings:
Boniface VII, Pope, -1303--Congresses.
Celestine V, Pope, 1215-1296.
Church history--Middle Ages, 600-1500--Congresses.
Princeton subject headings: