Columbia subject headings:
Caligula, Emperor of Rome, 12-41--Portraits.
Emperors--Rome--Portraits.
Portrait sculpture in numismatics--Rome.
Portrait sculpture, Roman.
Harvard subject headings:
Caligula, Emperor of Rome, 12-41--Portraits.
Portrait sculpture, Roman.
Princeton subject headings:
Caligula, Emperor of Rome, 12-41--Portraits.
Portrait sculpture, Roman.