Columbia subject headings:
Harvard subject headings:
Guards troops--Rome.
Praetorian Guard.
Rome--Army.
Rome--History--Empire, 30 B.C.-476 A.D.
Princeton subject headings:
Guards troops--Rome--History.
Praetorian Guard--Rome--History.
Rome--Army--History.
Rome--History, Military.
Rome--Politics and government--30 B.C.-68 A.D.
Sejanus, Lucius Aelius, -31.