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Abu Ja?far ?Abd Allah ibn Muhammad al-Mansur (; ‎; 714 - 6 October 775) usually known simply as by his ''laqab'' al-Mansur ??????? was the second Abbasid caliph, reigning from 754 to 775, succeeding his brother al-Saffah . He founded the 'Round City' of Madinat al-Salam, which was to become the core of imperial Baghdad.

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