Columbia subject headings:
Church history--Middle Ages, 600-1500.
Papacy--History--1309-1378.
Harvard subject headings:
Church history--14th century.
Papacy--History--1309-1378
Princeton subject headings:
Church history--Middle Ages, 600-1500.
Papacy--History--1309-1378.
Papacy--History--To 1309.