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
Deioces the Ecbatana Hill, was the true place of the ancient city of Ecbatana. Some historians, including Henry Rawlinson, believe that the Ecbatana mentioned in Herodotus's writings is not the current Hamadan; and the olden Median capital should be searched in Takht-e Soleymān and in the vicinity of Lake Urmia to the south east. But some researchers, like Jacques de Morgan, believe that Herodotus's Ecbatana is the same Hamadan today; and the places of the seven castles of Fort Ecbatana could be identified by the projections on the land and hills. Some Iranologists believe Deioces to be the Hushang in Shahnameh