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Encyclopaedia of Ismailism by Mumtaz Ali Tajddin

"Jafar bin Mansur, the son of Ibn Hawshab was greatly distressed by the internal quarrels in which his brother, Abul Hasan Mansur played a conspiracy in killing Abdullah bin Abbas al-Shawiri in Yamen. Jafar bin Mansur was deadly against his brother and went to Maghrib at the Fatimid court. He reached Maghrib when Imam al-Mahdi had died in 322/934. He was however well received by Imam al-Qaim and his services were amply rewarded and was given the charge of mission. He was held in great esteem for his learning and ability. He also served whole heartedly to Imam al-Mansur and Imam al-Muizz.

Jafar bin Mansur was first to be invested the title of Bab al-Abwab by Imam al-Muizz in Cairo, for which a separate mission cell was constituted. The residential palace of Imam al-Muizz and Jafar was nearby. He always remained close to the Imam in Maghrib and Egypt as well. He rose to such a great extent that he had been given superiority over Qadi Noman, which can be judged from an event that one day, the health of Qadi Noman became impaired, therefore many visitors excluding Jafar bin Mansur came to see him. When Qadi Noman recovered, he went to see Imam al-Muizz, who asked him as to who had come to see him while he was sick. Qadi Noman thereupon complained that many persons came except Jafar. Imam al-Muizz got annoyed at him and after a short while, he took out a book and gave it to Qadi Noman to read. Qadi Noman was highly astonished at the ability of its author. The Imam asked him to imagine the name of its author. Qadi Noman said, "There could be no one else except the Imam himself who could write so well." And the Imam replied, "You have mis-judged, for the book is written by Jafar bin Mansur." Qadi Noman admitted his mistake with an apology and went to the house of Jafar to pay his respect.

Jafar bin Mansur was a prolific writer and instituted the interpretation for the school of Ismaili writings. His main works are twelve, whose few manuscripts are preserved in the University Library of Leiden. Suffice it to say that the period of Imam al-Muizz would be barren without the intellectual, philosophical and mystical achievement of Jafar bin Mansur, who died in 365/975.

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