During the reign of Imam Qahir, the Imam once again began to govern both religious and temporal powers, the latter of which had been entrusted hitherto in the hands of an appointed prime minister or dai during the period of Dawri Satr. In taking over temporal rule from Muhammed bin Kaya, the third territorial ruler and hujjat at Alamut - the first two having been Hassan bin Sabbah and Kiya Buzrug Ummid, respectively - Imam Qahir appointed Muhammed as his vizier and the latter served as such until his death in 1162.

Born in Alamut, Imam Qahir's full name was al-Qahir bi Quowatullah. Physically well-built and handsome, he took an early interest in the governing of affairs at Alamut and succeeded to the Throne of Imamate when he was in his late thirties.

The reign of Imam Mohtadi was comparatively peaceful and prosperous. New castles were built and territories were expanded. The Imam passed away in Alamut where he was buried, and was succeeded by his son Qahir.

Imam Mohtadi, born in the fortress of Lamasar, was the first Ismaili Imam to have taken birth in Iran.

Imam Hadi was 21 years of age when he succeeded to the Throne of Imamate. Escaping imprisonment by his uncle Caliph Mustali, Imam Hadi established a new Ismaili kingdom at Alamut. Founded by Hassan bin Sabbah during the Imamate of Imam Mustansir Billah, the new state of Alamut was to last for 170 years, until the Imamate of Imam Ruknuddin Khairshah. During the reign of Imam Hadi, Ismailism spread from the Caspian to the Mediterranean Sea, as well as to Central Asia and India.