A change in leadership in Salamiyah in 899 led to a split in the movement. The minority Ismā‘īlīs, whose leader had taken control of the Salamiyah centre, began to proclaim their teachings - that Imām Muḥammad had died, and that the new leader in Salamiyah was in fact his descendant come out of hiding. Qarmaṭ and his brother-in-law opposed this and openly broke with the Salamiyids; when ‘Abdān was assassinated, he went into hiding and subsequently repented. Qarmaṭ became a missionary of the new Imām, Abdallah al-Mahdi Billah (873–934), who founded the Fatimid Caliphate in North Africa in 909.