Battle of Ecbatana Antiochus then dispersed his army into their winter quarters. However, the cities soon revolted against their presence. Phraates exploited the situation and attacked him as he marched to reinforce a garrison, inflicting a crushing defeat upon him at the Battle of Ecbatana. During the battle, Antiochus VII was killed and his royal guard was annihilated. After this, the rest of his army was largely destroyed, and the remainder was captured and folded into Parthian ranks. This battle marked the decisive and final defeat for the Seleucid Empire by the Parthians and ended the Hellenistic period in Iran. Battle of Ecbatana
Ecbatana identifying the Ecbatana/Hagmatana mentioned in later Greek and Achaemenid sources with the city Sagbita/Sagbat frequently mentioned in Assyrian texts, since the Indo-Iranian sound /s/ became /h/ in many Iranian languages. The Sagbita mentioned by Assyrian sources was located in the proximity of the cities Kishesim (Kar-Nergal) and Harhar (Kar-Sharrukin). It is now proposed that the absence of any mention of Ecbatana in Assyrian sources can be explained by the possibility that Assyria never became involved as far east as the Alvand mountains, but only in the western Zagros. Sir Henry Rawlinson attempted to prove that there was a second and