Columbia subject headings:
Emperors--Rome--Duties.
Rome--Army--Organization.
Rome--Army--Political activity.
Rome--Politics and government--30 B.C.-284 A.D.
Harvard subject headings:
Emperors--Rome--Duties
Rome--Army--Organization.
Rome--Army--Political activity.
Rome--Politics and government--30 B.C.-284 A.D.
Princeton subject headings:
Emperors--Rome--Duties.
Rome--Army--Organization.
Rome--Army--Political activity.
Rome--Politics and government--30 B.C.-284 A.D.