Columbia subject headings:
Emperors--Rome--Congresses.
Emperors--Rome--Portraits--Congresses.
Rome--Politics and government--284-476.
Harvard subject headings:
Emperors--Rome--Congresses.
Emperors--Rome--Portraits--Congresses.
Rome--Politics and government--284-476
Princeton subject headings:
Emperors--Rome--Congresses.
Emperors--Rome--Portraits--Congresses.
Rome--Politics and government--284-476.