Columbia subject headings:
Parthia--Foreign relations--Rome.
Rome--Foreign relations--Iran--Parthia.
Rome--History--Empire, 30 B.C.-284 A.D.
Harvard subject headings:
Parthia--Foreign relations--Rome.
Rome--Foreign relations--Iran--Parthia.
Rome--History--Empire, 30 B.C.-476 A.D.
Princeton subject headings:
Parthia--Foreign relations--Rome.
Rome--Foreign relations--Iran--Parthia.
Rome--History--Empire, 30 B.C.-284 A.D.