A famous encyclopaedia, known as Rasail Ikhwan as-Safa, was written in 51 volumes by a group of Ismailis under the supervision of Imam Taki Mohammed, who personally wrote the 52nd volume. The said encyclopaedia deals with Logic, Sciences, Mathematics, Medicine, Astronomy.. Professor Yves Marquet wrote a lot on this subject.

It was in his Will that Imam Sultan Muhammad Shah appointed Mowlana Shah Karim as Pir and Imam of all Ismailis.

Hazrat Ali had two well-known sons. One of them, Hazrat Hussein inherited the Imamat from his father, and the other, Hazrat Hassan, received the Piratan.

The Medical Canon written by the Ismaili philosopher and doctor Ibn Sina [Avicenna] at the time of the Fatimids was used as a medical reference book for several centuries in Europe. It described many symptoms of known and lesser known diseases like cancer.

The Great Resurrection (Qiyamat al-Qiyamat) by Mowlana Alazikrihis-Salaam was the proclamation of a purely spiritual religion at Alam

Pir Shams wrote a long treatise named Man Samjani, it contained 10,000 verses divided in 500 chapters of 20 verses each. Unfortunately the last 80 pages were missing in the only manuscript found therefore the first published version in Khojki contained only 401 chapters of 20 verses for a total of 8020 verses.

Pir Nasiruddin's father, Pir Shams, was very fond of travels. He had established 84 Jamat Khanas in China. [Source: Man Samjani, Chap. 266, v.15]

Pir Sadardin composed the previous Du'a, which was recited by Ismailis during several centuries, was very long and took almost half an hour to be recited. His "Gat Paj ji Dua" allso summarized the story of Creation.

Pir Sadardin, son of Pir Sahibdin, founded approximately 70 Jamat Khanas in Sind. He founded the first Jamat Khana in Kotara.

Qadi a-Numan, Ismaili jurist served the first 4 fatimid Caliphs of Egypt. He became very famous in the Muslim world. He is also the author of many legal and religious books, i.e. "Daim al-Islam" and "Asas al-Tawil".