Columbia subject headings:
Harvard subject headings:
Courts--Rome--History.
Emperors--Rome--History.
Rome--History--Severans, 193-235.
Rome--Kings and rulers.
Rome--Politics and government--30 B.C.-284 A.D.
Princeton subject headings:
Rome--History--Severans, 193-235.
Rome--Kings and rulers.
Rome--Politics and government--30 B.C.-284 A.D.