Muhammad III of Alamut

ʿAlāʾ ad-Dīn Muḥammad III (علاءالدین محمد; 1211–1255), more commonly known as ʿAlāʾ ad-Dīn (علاءالدین), son of Jalāl al-Dīn Ḥasan III, was the 26th Nizāri Isma'ilism Imām. He ruled the Nizari Ismaili state from 1221 to 1255. By some accounts, he was considered a respected scholar and the spiritual and worldly leader of the Nizari Ismailis. The intellectual life of Persia has been described as having flourished during his 34-year reign. Allegedly, he was known for his tolerance and pluralism. His reign witnessed the beginnings of the Mongol conquests of Persia and the eastern Muslim world. He was assassinated by an unknown perpetrator on 1 December 1255, and was succeeded by his eldest son, Rukn al-Din Khurshah, in 1255.