Explanation

The Abbasid caliphs established the city of Baghdad in 762 CE. It became a center of learning and the hub of what is known as the Golden Age of Islam.

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Abbasid caliphate, second of the two great dynasties of the Muslim empire of the caliphate.

It overthrew the Umayyad caliphate in 750 ce and reigned as the Abbasid caliphate until it was destroyed by the Mongol invasion in 1258.