Columbia subject headings:
Emperors--Rome.
Rome--Politics and government--30 B.C.-476 A.D.
Rome. Senate.
Harvard subject headings:
Emperors--Rome
Rome--Politics and government--30 B.C.-476 A.D.
Rome. Senate.
Princeton subject headings:
Emperors--Rome.
Rome--Politics and government--30 B.C.-476 A.D.