While this empire was fighting Antiochus III, it massacred all the Greeks in the city of Syrinx.
While this empire was fighting Antiochus III, it massacred all the Greeks in the city of Syrinx. This empire moved its capital to Ctesiphon following an incident in which its general Surenas captured the Roman standards after killing Crassus at Carrhae. This Arsacid-ruled empire was eventually displaced by the Sassanids. For 10 points, identify this empire in present day Iran.
While this empire was fighting Antiochus III, it massacred all the Greeks in the city of Syrinx.
{Parthians} [or {Arsacid} Empire before it is read; prompt on Iranian or Persian Empire]