Columbia subject headings:
Harvard subject headings:
Artists--Italy--Rome.
Callistus III, Pope, 1378-1458.
Condottieri--Italy--History.
Condottieri.
Eugene IV, Pope, 1383-1447.
Martin V, Pope, 1368-1431.
Nicholas V, Pope, 1397-1455.
Papacy--History
Papal courts--History.
Singers--Italy--Rome.
Princeton subject headings:
Artists--Italy--Rome.
Condottieri.
Papal courts--History.
Singers--Italy--Rome.