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Abu Ja'far Abdallah ibn Muhammad al-Mansur (712 – 775; Arabic: ابو جعفر عبدالله ابن محمد المنصور) was the second Abbasid Caliph. He was born at al-Humaymah, the home of the 'Abbasid family after their emigration from the Hejaz in 687–688. His father, Muhammad, was a great-grandson of 'Abbas; his mother was a Berber slave[1]. He reigned from 754 until 775. In 762 he founded as new imperial residence and palace city Madinat as-Salam, which became the core of the Imperial capital Baghdad.