Al-Mansur, by his political and military measures,…
October 775 CE
Al-Mansur, by his political and military measures, has firmly established the 'Abbasid caliphate.
Furthermore, he had arranged the succession in favor of his son, al-Mahdi, who at the former’s death in October 775 becomes the third 'Abbasid caliph.
Al-Mahdi has two sons, al-Hadi and Harun.
Harun, four years younger than al-Hadi, has as tutor Yahya ibn Khalid (the Barmakid), a loyal supporter of his mother al-Khayzuran, a formerly enslaved girl from Yemen and a woman of strong personality who greatly influences affairs of state in the reigns of her husband.