The Siege of Alamut took place in December 1256, and marks the fall of the strategic fort of Alamut Castle, which was the capital of the Nizari Ismaili state, to the Mongol Empire under Hulegu Khan. Following the capitulation of the Nizari Imam, Rukn al-Din Khurshah during the siege of Maymun-Diz, Hulegu Khan dispatched forces to secure the fortress. Although difficult to assault and well-provisioned for a long siege, the commander of the fortress, Muqaddam al-Din Muhammad Mubariz, capitulated the stronghold in obedience to the Imam's orders. The Mongols subsequently dismantled the fortifications and destroyed its famous library, officially ending the Nizari state as a political entity in Persia.
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