Columbia subject headings:
Rome--History--Julio-Claudians, 30 B.C.-68 A.D.
Harvard subject headings:
Emperors--Succession--Rome
Rome--History--Julio-Claudians, 30 B.C.-68 A.D.
Princeton subject headings:
Emperors--Succession--Rome.
Rome--History--Julio-Claudians, 30 B.C.-68 A.D.