During the latter Sassanids it is seldom mentioned, and when the Arabs came to Khorasan (641-642) it was of so little importance that, as Tabari relates, it did not even have a garrison.
His kingdom was honeycombed with Christianity, and he wished to draw closer to the West, where he foresaw the victory of the new faith, in order to fortify his realm against the Sassanids of Persia.
Other names occur on their coins, the oldest of which are imitations of Seleucid coins, and were perhaps struck by local dynasts under their supremacy; most of the others show the king's head with the Persian tiara, and on the reverse a fire-altar with the adoring king before it, a standard (perhaps the famous banner of the smith Kavi, which became the standard of Iran under the Sassanids), and occasionally the figure of Ahuramazda; they were first explained by A.
It was a great city under the Sassanids, of which some ruins are extant.
But it shared the fate of its predecessor; when the empire was founded the Sassanids could no longer remain in Persis but transferred their headquarters to Ctesiphon.