It is al-Musta'sim!
al-Musta'sim-Billah Abu-Ahmad Abdullah bin al-Mustansir-Billah was the last Caliph of Baghdad (1242-1258). He is best known for being the incompetent ruler who defied the Mongol commander Hulagu, and therefore being indirectly responsible for the destruction of Baghdad (1258) and the end of the Abbasid Caliphate. In effect, Baghdad, once the cultural, intellectual and political centre of the Islamic world, was leveled and never regained the key role it once possessed.
There are various conflicting reports about the end of the Caliph himself, but the most persistent one is that the Mongols believed it would cause bad fortune to lay hand on the Caliph himself- and therefore covered him in rugs and pillows so that he would suffocate.
Your go, Foro!