His moniker is translated as "the Upright," and he was the son of al- Madhi. Succeeding to the throne upon the death of his brother al-Hadi, his rule 
His moniker is translated as "the Upright," and he was the son of al- Madhi. Succeeding to the throne upon the death of his brother al-Hadi, his rule marked a notable development of culture. He deposed the Barmecides family, which held administrative power as grand viziers to the caliphate. Baghdad became the most flourishing city of his period and he is said to have exchanged gifts with Charlemagne. FTP, identify this fifth caliph of the Abbasid dynasty whose court would be known to Westerners as the one described in the Arabian Nights.
His moniker is translated as "the Upright," and he was the son of al- Madhi.
{Harun} ar-Rashid