After the fall of the Fatimid Empire, the Nizari Ismailis acquired political prominence in Persia where they once again had a state of their own. The Nizari state, centered at Alamut, lasted over 160 years until it collapsed under Mongol invasion. The first two post-Alamut centuries in Nizari Ismaili history remain rather obscure. The Imams went into hiding, losing direct contact with the community. Many of the Persian Ismailis found refuge in Central Asia, Afghanistan, or India. The scattered Nizari communities developed independently under local leadership.
By the middle of the fifteenth century, when Shia sentiments were gaining increasing popularity in Persia, the Anjudan revival of Nizarism commenced during the Imamate of Mustansir billah I. The Imams selected Anjudan only after a thorough search for a suitable locality to establish their residence and dawa headquarters. Anjudan had a central position and was conveniently close to the cities of Qumm and Kashan that were traditional Shia centres in Persia. The Anjudan renaissance in Nizari Ismailism also brought about a revival of literary activities amongst the Nizaris.
— Farhad Daftary, The Ismailis: Their History and Doctrines (Cambridge: Cambridge University Press, 1990)