Columbia subject headings:
Athens (Greece)--History--Fiction.
Iran--History--To 640--Fiction.
Harvard subject headings:
Ambassadors--Fiction
Athens (Greece)--Fiction.
Iran--History--To 640--Fiction.
Iranians--Foreign countries--Fiction.
Xerxes I, King of Persia, 519 B.C.-465 B.C. or 464 B.C.--Fiction.
Princeton subject headings: