Taken by illness in 1162 AD, Muhammad was succeeded by Hasan, who was then about thirty-five years of age. Only two years after his accession, the Imam Hasan, apparently conducted a ceremony known as qiyama (resurrection) at the grounds of the castle of Alamut, whereby the Imam would once again become visible to his community of followers in and outside of the Nizārī Ismā'īlī state. Given Juvayni'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. Fortunately, descriptions of this event are also preserved in Rashid al-Din’s narrative and recounted in the Haft Bab-i Abi Ishaq, an Ismaili book of the 15th century AD. However, these are either based on Juvayni, or don't go into great detail. No contemporary Ismaili account of the events has survived, and it is likely that scholars will never know the exact details of this time.
