a shock to the whole Muslim world; after many years of utter devastation, the city became an economic center where international trade, the minting of coins and religious affairs flourished under the Ilkhans. The chief Mongol darughachi was thereafter stationed in the city. Berke, who had converted to Islam in 1252, became enraged that Hulagu destroyed Baghdad. Muslim historian Rashid al Din quoted Berke Khan as sending the following message to Mongke Khan, protesting the attack on Baghdad, (not knowing Mongke had died in China): "He (Hulagu) has sacked all the cities of the Muslims. With the help of God I will call him to account for so much innocent blood." Although hesitant at first to go to war with Hulagu out of Mongol brotherhood, the economic situation of the Golden Horde led him to declare war against the Ilkhanate. This became known as the Berke–Hulagu war. Caliphate of Cairo Al-Musta'sim was killed by Hulagu. Al-Musta'sim ruled from 5 December 1242 to 20 February 1258, for a period of 15 years, 2 months and 15 days. His death marked the final end of the caliphate as a political and religious entity in the Middle East. The Mamluk Sultans of Egypt and Syria later appointed an Abbasid prince as caliph of Cairo, but these Mamluk Abbasid caliphs were marginalized and merely symbolic, with no temporal power and little religious influence. Even though they kept the title for about 250 years more, other than installing the Sultan in ceremonies, these caliphs had little importance. After the Ottomans conquered Egypt in 1517, the caliph of Cairo, al-Mutawakkil III was transported to Constantinople. Centuries later, a tradition developed saying that, at this time, al-Mutawakkil III formally surrendered the title of caliph as well as its outward emblems—the sword and mantle of Muhammad—to the Ottoman sultan Selim I, establishing the Ottoman sultans as the new caliphal line. Some historians have noted that this story does not appear in the literature until the 1780s, suggesting that it was advanced to bolster the claims of caliphal jurisdiction over Muslims outside of the empire, as asserted in the 1774 Treaty of Küçük Kaynarca. See also Sulaiman Shah Abbasid official and commander-in-chief Yaqut al-Musta'simi a well-known calligrapher and secretary of al-Musta'sim. Mongol invasions of the Levant Tekuder, son of Hulagu and a Muslim convert. References Sources 1213 births 1258 deaths 13th-century Abbasid caliphs 13th-century Arabs 13th-century executions Monarchs taken