Al-Hakim I (Arabic: الحاكم بأمر الله الأول‎) Abu al-'Abbas Ahmad ibn Abi 'Ali al-Hasan held the position of the second Caliph of Cairo for the Mamluk Sultanate between 1262 to 1302. Al-Hakim I held the position of the Caliph of Cairo from 1262 to 1302. He was an alleged great-great-great grandson of the Abbasid Caliph al-Mustarshid, who had died in 1135. When Baghdad fell to the Mongols in 1258, al-Hakim I escaped to Damascus where he befriended the Arab tribal chief 'Isa ibn al-Muhanna, who tried to set him up as caliph, but in the confusion surrounding the Mongol invasion of Syria in 1259-1260, he ended up in Aleppo, where he was proclaimed. However, the much closer and probably genuine uncle of the last Abbasid caliph al-Musta'sim, Ahmad al-Mustansir, was proclaimed caliph in Cairo in 1