Columbia subject headings:
Constitutional law--Rome.
Emperors--Rome.
Harvard subject headings:
Augustus, Emperor of Rome, 63 B.C.-14 A.D.
Constitutional history--Rome
Emperors--Rome
Executive power--Rome.
Roman law--History.
Rome--Politics and government--30 B.C.-68 A.D.
Princeton subject headings:
Roman law--History.
Rome--Constitutional history.