Columbia subject headings:
Iran--History--To 640.
Rome--Foreign relations.
Rome--History--Empire, 284-476.
Sassanids.
Harvard subject headings:
Iran--History--To 640.
Rome--Foreign relations--284-476.
Rome--History--Empire, 284-476.
Sassanids.
Princeton subject headings:
Iran--History--To 640.
Rome--Foreign relations--284-476.
Rome--History--Empire, 284-476.
Sassanids.