His mother, Khayzuran, was a slave girl from Yemen who influenced his early reign.  
His mother, Khayzuran, was a slave girl from Yemen who influenced his early reign.  He came to the throne upon the death of his brother Hadi with the help of the powerful Barmakid family, which initially dominated his rule.  Masrur was his executioner and Jafar was possibly his most famous adviser.  Under this ruler Baghdad became the most prosperous city in the world, but that ended soon after his death in 809.  FTP, name this fifth Abbasid caliph who appeared in the stories of The Thousand and One Nights.
His mother, Khayzuran, was a slave girl from Yemen who influenced his early reign.  
Harun ar-Rashid