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.

Mowlana Imam Hadi, the 20th Imam of the Ismailis, was born in Cairo in the year 462AH (1069AD) during the Imamat of his grandfather Imam Mustansir Billah.

Al-Mustali, the younger half-brother of Imam Nizar, in a wave of political ambitions of perverse administrators of the state, would himself come to be the leader of the seceding sect of the Ismailis, the Bohras. In coming to terms with the reality of this situation, Imam Nizar, upon the death of his father Imam Mustansir Billah, left Cairo for Alexandria where he found the support and allegiance of both the governor and the qadi of Alexandria.

Imam Nizar was born on the 10th of Rabi-el-Awwal, 437AH, 1045AD, in Cairo. He would succeed his father as the 19th Imam of the Ismailis at the age of 51 years.

During his reign, political unrest amidst a massive earthquake contributed to much of the insecurity and economic instability throughout the Fatimid territory. Notable personalities who lived during this Imam's rule include among others Hassan bin Sabbah, Nasir Khusraw, and Omar Khayyam. Pir Muhammed Shah, more commonly known as Pir Satgur Noor, was one of the Hujjatal Pirs at this time in the lineage of pirs. At the death of Imam Mustansir Billah, a split took place among the Ismailis, with the seceders, who would come to be known as the Bohras, following Caliph Mustali.

Imam Mustansir Billah was born on the 17th of Jama'di-el Thani, 420 AH, 1029AD, in Cairo. He would become the eighth Fatimid Caliph at the early age of seven years, and reign as Imam and Caliph for a period of more than 60 years.