Columbia subject headings:
Christian art and symbolism--Italy--Rome--Medieval, 500-1500.
Papacy--History--To 1500.
Popes--Art patronage--History.
Popes--Biography.
Harvard subject headings:
Christian art and symbolism--Italy--Rome--Medieval, 500-1500.
Papacy--History--To 1500.
Popes--Art patronage--History--To 1500.
Popes--Biography
Princeton subject headings:
Christian art and symbolism--Italy--Rome--Medieval, 500-1500.
Papacy--History--To 1500.
Popes--Art patronage--History.
Popes--Biography.