 Asōristān was devolved by 639, bringing an end to over 3000 years of Assyria as a geopolitical entity.A century later, the area became the capital province of the Abbasid Caliphate and the centre of Islamic Golden Age for five hundred years, from the 8th to the 13th centuries.After the Muslim conquest, Asōristān saw a gradual but large influx of Muslim peoples; at first Arabs, but later also including Iranian and Turkic peoples.