As the only son of ibn Hawshāb to follow in his footsteps after his death, Ja‘far was often at odds with his brother Abū al-Ḥasan. Their mutual estrangement eventually forced Ja‘far to emigrate to North Africa, where he arrived during the reign of the second Faṭimid caliph al-Qā'im (r. 322-34AH/933-46CE).[4] There he witnessed the anti-Fāṭimid revolt led by Khārajī Berber Abū Yazīd, which began in the last two years of al-Qā'im's reign and ended in the first regnal year of his successor, al-Manṣūr (r.