States People Centers Other Ḥasan ʿAlā Zikrihi's-Salām[1] (Persian/Arabic: حسن على ذكره السلام) or Hassan II was the hereditary Imam of the Nizari Isma'ilis of the Alamut Period from 1162 until 1166.

One of the only historical reference extant, Juwayni (who was hostile to Ismailis), claims that Hassan was the son of Muhammad ibn Buzurg-Ummid, Fatimid dai and lord of Alamut.

In 1164 Hassan, leading the Nizari sect of Ismaili Islam, proclaimed the Qiyamat, the abrogation of Sharia law.

Given Juwayni's polemical aims, and the fact that he burned the Ismā'īlī libraries which may have offered much more reliable testimony about the history, scholars have been dubious about his narrative but are forced to rely on it given the absence of alternative sources.

He was succeeded by his son Imām Nūr al-Dīn Muhammad, who refined and explained Hasan's doctrine of qiyamah in greater detail.