Nevertheless, he was unable to stop the Seleucid expedition and was forced to leave Parthia for Central Asia, where he took refuge with the Apasiacae. The Seleucid conquest proved to be short-lived; due to issues in the western portions of the Seleucid Empire, Seleucus II was forced to leave Parthia, which gave Arsaces the opportunity to regain his lost territories, and most likely also expand his dominion further south. Indeed, Arsaces' withdrawal to the Apasiacae was perhaps a strategic move, since Seleucus II neither possessed the resources to chase him nor the time to conclude a peace treaty. Arsaces also made an alliance with the Greco-Bactrians, which confirms that contact between the two powers had most likely been established long ago. According to the Roman historian Justin, Arsaces "settled the Parthian government, levied soldiers, built fortresses, and strengthened his towns." Apart from Asaak, he also founded the city of Dara in Mount Zapaortenon, a place in Parthia. Nisa, likewise founded by Arsaces, would be then used as the royal residence of the Arsacids till the 1st-century BC.