 As a consequence, Usama and his brothers were exiled from Shayzar, finding asylum with Nur ad-Din, the Zengid emir of Aleppo.After Sultan's death in 1154, Taj al-Mulk Muhammad succeeded him without incident.Most of the Banu Munqidh, including Taj al-Mulk and his children, died in the collapse of the Shayzar citadel during the August 1157 earthquake, which devastated a number of other towns in the area.