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"In 489/1095, Hasan bin Sabbah had sent Kiya Buzrug Ummid with a troop to conquer the fortress of Lamasar in 489/1095. He defeated a certain Rasmasuj and took possession of Lamasar, also known as Rudhbar-i Alamut. According to Jamiut Tawarikh (pp. 27-8), "The fort of Lamasar was situated on a rotten hill, with a few decayed houses on it, with no vegetation nearby. The climate of the place was very hot. Kiya Buzrug Ummid fortified the castle and cut the rocks to build a canal from a point on the Nine-rud, two and a half farsakhs away, which could supply water to the fort. The fort was thus irrigated. Water reservoirs were made and trees were planted and the fort began to look a royal rest house (khushk) in a garden. It was put in charge of Kiya Buzrug Ummid." Since then, he controlled the affairs of Lamasar till the death of Hasan bin Sabbah. Lamasar held out for another year before cholera broke out and killed the bulk of garrison. The few who survived the epidemic had no alternative but to surrender in 655/1258 before the Mongols.