Columbia subject headings:
Caligula, Emperor of Rome, 12-41.
Nero, Emperor of Rome, 37-68.
Rome--History--Caligula, 37-41.
Rome--History--Nero, 54-68.
Harvard subject headings:
Caligula, Emperor of Rome, 12-41.
Emperors--Rome--Portraits
Nero, Emperor of Rome, 37-68.
Rome--Antiquities.
Rome--History--Caligula, 37-41.
Rome--History--Nero, 54-68.
Princeton subject headings:
Caligula, Emperor of Rome, 12-41.
Emperors--Rome--Portraits.
Nero, Emperor of Rome, 37-68.
Portraits.
Rome--History--Caligula, 37-41.
Rome--History--Nero, 54-68.