Berjew, British Library After the fall of the Umayyads , the first Muslim dynasty, the victorious Abbasid rulers wanted their own capital from which they could rule. They chose a site north of the Sassanid capital of Ctesiphon and also just north of where ancient Babylon had once stood , and on 30 July  the caliph Al-Mansur commissioned the construction of the city. It was built under the supervision of the Barmakids. Mansur loved the site so much he is quoted saying:
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