Yazid was a descendant of Khalid ibn Abdallah al-Qasri (died 743), the powerful governor of Iraq on behalf of the Umayyads. He is possibly to be identified with a Yazid ibn Jarir who twice served as governor of Sistan during the caliphate of Harun al-Rashid (r. 786–809), first as deputy to al-Fadl ibn Yahya in 794 and then under Ali ibn Isa ibn Mahan in 797.[1]