Columbia subject headings:
Benefices, Ecclesiastical--History--Middle Ages, 600-1500.
Expectancies (Law)
Papacy--History--Middle Ages, 600-1500.
Harvard subject headings:
Benefices, Ecclesiastical.
Gregory XII, Pope, approximately 1325-1417.
Princeton subject headings:
Benefices, Ecclesiastical--History.
Expectancies (Law)
Papacy--History.