Assertion: caliph's son | /r/HasProperty | third abbasid caliph
Facets:
Source sentences:
text: He was the son of al-Mahdi, the third Abbasid caliph (ruled 775 – 786), and al-Khayzuran, a former slave girl from Yemen, who was a woman of strong personality and who greatly influenced affairs of state in the reigns of her husband, mother and sons.