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Setting the scene
By 1258, the Mongol Empire under Möngke Khan had conquered most of Asia. His brother Hulagu was tasked with conquering the Middle East, destroying the Assassins (achieved 1256) and then the Abbasid Caliphate. The Abbasids, who had ruled since 750, were now weak figureheads controlling only Baghdad and environs. Caliph al-Musta'sim, the 37th Abbasid caliph, was arrogant and failed to prepare defenses, believing his religious status would protect him. He rejected Hulagu's demands to submit and insulted the Mongols.
What happened
In January 1258, Hulagu's army—perhaps 150,000 Mongols plus Christian and Muslim allies—besieged Baghdad, the world's largest city with perhaps 1 million inhabitants. The Mongols used Chinese siege engineers and catapults. After a week, the city surrendered on February 10. The Mongols sacked Baghdad for a week, massacring 200,000-1,000,000 people. They destroyed the House of Wisdom and threw so many books into the Tigris that the river ran black with ink. Al-Musta'sim was executed—wrapped in a carpet and trampled by horses, as Mongols believed shedding royal blood would offend the earth.
Why it still matters
The sack of Baghdad ended the Abbasid Caliphate and the Islamic Golden Age, a catastrophic blow to Islamic civilization from which it never fully recovered. It marked the first time a Mongol army had destroyed a major Muslim capital, shattering the myth of Islamic invincibility. The destruction of Baghdad's libraries and scholars caused irreparable loss of knowledge. The sack also ended the classical caliphate—though a shadow Abbasid caliphate was later established in Cairo under Mamluk protection. The Mongol conquest shifted Islamic power to the Mamluks in Egypt and later the Ottomans. Baghdad would not recover its prominence for centuries. The sack remains a traumatic memory in the Muslim world, symbolizing civilization's fragility.
Background
The event marked the end of Abbasid caliphal rule in Baghdad. Even centuries later, this episode remains a reference point for how empires rise, fracture, and transform.