 After the Turks besieged Baghdad, Al-Musta'in planned to abdicate to Al-Mu'tazz but was put to death by his order.Al-Mu'tazz was enthroned by the Turks, becoming the youngest Abbasaid Caliph to assume power.Al-Mu'tazz proved too apt a pupil of his Turkish masters, but was surrounded by parties jealous of each other.