Columbia subject headings:
Rome--History--Julio-Claudians, 30 B.C.-68 A.D.
Rome--Politics and government--30 B.C.-68 A.D.
Harvard subject headings:
Rome--History--Empire, 30 B.C.-284 A.D.
Rome--Kings and rulers--Succession.
Rome--Politics and government--30 B.C.-284 A.D.
Princeton subject headings:
Rome--History--Julio-Claudians, 30 B.C.-68 A.D.
Rome--Politics and government--30 B.C.-68 A.D.