Mongols Sack Baghdad Destroying Abbasid Caliphate

Context

The Mongol Empire expanded dramatically across Eurasia in the first half of the thirteenth century under Genghis Khan and his successors. By the 1250s, Möngke Khan directed his brother Hulegu to secure the western territories, beginning with the elimination of the Nizari Ismaili strongholds in Persia that had long troubled regional powers.

What Happened

Hulegu assembled a large army that included Mongol core troops supplemented by Armenian, Georgian, Chinese, and Persian auxiliaries. After destroying the Nizari state at Alamut in 1256, the Mongols advanced into Mesopotamia when Caliph al-Musta'sim rejected demands for submission and refused to send reinforcements. In January 1258 a large Abbasid sortie was defeated outside the city walls, after which Mongol forces fully invested Baghdad.

Aftermath

The caliph surrendered on February 10, and three days later Mongol troops entered the city. Systematic looting followed, targeting palaces, mosques, and libraries; the House of Wisdom was destroyed and many of its books reportedly cast into the Tigris. Al-Musta'sim and much of his family were executed shortly afterward.

Legacy

The fall of Baghdad ended the Abbasid Caliphate as a political entity, removing its symbolic authority over the Sunni Islamic world. Power in the region shifted toward the Mongol Ilkhanate, while Baghdad itself declined in importance relative to new centers such as Tabriz; later historians have debated the event's precise role in closing the Islamic Golden Age, noting continued scholarly activity elsewhere and under Ilkhanid patronage.