قلعة ألموت
In 1256, Rukn al-Din commenced a series of gestures demonstrating his submission to the invading Mongols. In a show of his compliance and at the demand of Hulagu Khan, Rukn al-Din began the dismantling process at Alamut Castle, Maymundiz and Lambsar Castle, removing towers and battlements. However, as winter approached, Hulagu took these gestures to be a means of delaying his seizure of the castles and on 8 November 1256 the Mongol troops quickly encircled the Maymundiz fortress and residence of the Imam. After four days of preliminary bombardment with significant casualties for both sides, the Mongols assembled their mangonels around the castle in preparation for a direct siege. There was still no snow on the ground and the attacks proceeded, forcing Rukn al-Din to declare his surrender in exchange for his and his family's safe passage. After another bombardment, Rukn al-Din descended from Maymundiz on 19 November.