Quick Facts
Born:
1212
Died:
1258 (aged 46)
Britannica AI Icon
Adding us as a Preferred Source tells Google you trust our content, so our articles show up more often in your Google Search, Discover feed, and AI Overviews.
verifiedCite
While every effort has been made to follow citation style rules, there may be some discrepancies. Please refer to the appropriate style manual or other sources if you have any questions.
Select Citation Style
Feedback
Corrections? Updates? Omissions? Let us know if you have suggestions to improve this article (requires login).
Thank you for your feedback

Our editors will review what you’ve submitted and determine whether to revise the article.

External Websites

al-Mustaʿṣim (born 1212—died 1258) was the last ʿAbbāsid caliph in Baghdad (reigned 1242–58).

Ineffectual himself and surrounded by advisers with conflicting opinions, al-Mustaʿṣim presented no strong defense against the Mongol conqueror Hülegü, grandson of Genghis Khan. Al-Mustaʿṣim ignored several demands of Hülegü and answered others with blustering and empty threats. Finally Hülegü laid siege to Baghdad in 1258 and entered the city in February of that year. The caliph and 300 officials hurried to present their surrender and, 10 days later, were all put to death. This left Islām without a caliph for the first time in its history. Hülegü burned and plundered the city, killed many of its inhabitants, and later invaded Syria and then returned to Persia.

This article was most recently revised and updated by Encyclopaedia Britannica.
Discover the fascinating events that shaped the world, straight from our editors.
By clicking “Sign Up”, you consent to the Britannica Privacy Policy and Terms of Use.