Explanation

Abū Jaʿfar ʿAbd Allāh ibn Muḥammad al-Manṣūr was the second Abbasid caliph, reigning from 136 AH to 158 AH succeeding his brother al-Saffah.

He is known for founding the 'Round City' of Madinat al-Salam, which was to become the core of imperial Baghdad. 

Born: 714 AD, Humayma

Died: October 6, 775 AD, Mecca, Saudi Arabia