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Built the Mustansiriya Madrasa in Baghdad.
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Al-Mustansir I founded the Mustansiriya Madrasa in Baghdad, a major educational institution teaching Islamic law, medicine, mathematics, and literature. It became one of the largest and most advanced universities of the medieval Islamic world.
Al-Mustansir I reorganized the Abbasid army, recruiting Turkic slave soldiers (mamluks) and strengthening defenses against Mongol threats. He built a new garrison city near Baghdad to house these troops.
See how Al-Mustansir I stacks up against other historical figures