 He reportedly received the Caliph's final instructions, charging him with managing the affairs of al-Aziz's 11-year-old son and heir, al-Hakim.After the death of al-Aziz, the Berbers seized the opportunity and compelled al-Hakim to dismiss the Christian vizier Isa ibn Nasturus (who was executed shortly after) and appoint Ibn Ammar to head the government, albeit with the title of "wāsiṭa" ("intermediary") rather than full vizier.Ibn Ammar's rule quickly descended into tyranny