Siege of Maymun-Diz

Asia
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Siege of Maymun-Diz
	Part of the Mongol campaign against the Nizaris
Date	8–23 November 1256 (15 days)
Location	Maymun-Diz (exact location disputed), Rudbar of Alamut
Result	Mongol victory The Nizari leadership capitulated; Maymun-Diz and most other Nizari fortresses capitulated and were demolished;
Belligerents
Mongol Empire Golden Horde; Chagatai Khanate; Oirats; Supported by the local rulers of Anatolia, Tabaristan, Fars, Iraq, Azerbaijan, Arran, Shirvan, Georgia, and Armenia	Nizari state of Alamut
Commanders and leaders
Hülegü; Kitbuqa; Tegüder; Buqa Temür; Köke Ilgei; Guo Kan; Quli; Balagha; Tutar; Abaqa; Yoshmut; Arghun Aqa;	Imam Rukn al-Din Khurshah ; Khwaja Nasir al-Din Tusi ;
Strength
80,000 men 1,000 squads of siege engineers;	Heavily outnumbered and outgunned

The siege of Maymun-Diz, an unlocated fortress and the stronghold of the leader of the Nizari Ismaili state, Imam Rukn al-Din Khurshah, occurred in 1256, during the Mongol campaign against the Nizaris led by Hülegü.

The new Nizari Imam was already engaged in negotiations with Hülegü as he was advancing toward his stronghold. The Mongols insisted that all Nizari fortresses be dismantled, but the Imam tried to negotiate a compromise. After several days of fighting, the Imam and his family capitulated and were received well by Hülegü. Maymun-Diz was demolished, and the Imam ordered his subordinates to surrender and demolish their fortresses likewise. The subsequent capitulation of the symbolic stronghold of Alamut marked the end of the Nizari state in Persia.