Al-Mu'ayyad was born in
Shiraz not later than 387/997 and died in Cairo in 470 AH/1078 AD. He lived during the time of the Fatimid Caliphs Al-Hakim (386–412 AH / 996–1021 AD), Al-Zahir (412–427 AH / 1021–1036 AD) and Al-Mustansir (427–48AH / 1036–1094AD). He was buried in the Dar al-ilm where he had resided, worked and died. Al-Muayyad's real name was Hibatullah ibn Musa, born in the town of
Shiraz, capital of the
Fars province (then
Persia, now in modern-day
Iran), in the year 1000
CE. His father, Musa ibn Dawud, served under the Fatimid Caliph-Imam
al-Hakim bi Amr Allah as the
Chief Missionary of the province of Fars, where the Isma'ili mission was active. Al-Muayyad was "contemporary with the changeover from the Buyid to the Saljuq Sultanate under the Abbasid Caliphate, as well as the Arab bedouin Hilalian invasion of North Africa, the Fatimiid encouraged invasion of Baghdad by al-Basasiri, the Battle of Manzikert in Anatolia, the rise of the Sulayhids of Yemen and the advent of the Armnenian General
Badr al-Jamali in Egypt". During the reign of the Fatimid Caliph-Imam
al-Zahir li-i'zaz Din Allah, Hibatullah ibn Musa was permitted to take over the ''da'wah
office from his father. His title, Al-Mu'ayyad fi d-Din'' ('The one aided in religion') was probably accorded to him around this time. Al-Mu'ayyad was appointed to the Diwan al-insha' (secretariat) in 440 AH / 1048 AD on a monthly salary of 1000 dinars and wrote the religious sermons (al-Majalis) for al-Yazuri (as-Sira 89–90). Al-Mu'ayyad gives us an interesting information about the presence of a Buyid Prince Abu 'Ali in the Fatimid Court (as-Siras 87). Al-Muayyad (Hibatullah) gradually worked his way up the hierarchy of the
da‘wa and was eventually appointed Chief Missionary under the Caliph-Imam
al-Mustansir Billah. He was appointed the head of the Academy of Science (Dar al-'Iim, originally been founded by the Caliph al-Hakim in Cairo), which was also the headquarters of the Da'wa and became the residence of al-Mu'ayyad. He directed the Da'wa affairs throughout the Fatimid sphere of influence particularly Persia, Yemen, Bahrayn and Northern and Western India ('Uyun – ms. – fols. 59–63, 65). In this position, he worked teaching missionaries from both inside and outside the Fatimid Empire and composing his theological works until the end of his life in 1078
CE. He founded the dynamic tradition of
Fatimid daʿwa ('religious mission') poetry that flourished after him for a thousand years through the succeeding
Taiyabi daʿwa and continues to thrive today. His poetry uses a unique form of esoteric tāwīl-based religious symbolism – metaphor, in fact, as manifestation, where what appears to be metaphor is the theological reality of the Imam. The primary source for details of Al-Mu'ayyad's life are his own memoirs, the ''Sirat al-Mu'ayyad fi d-Din'', which was written in three stages between the years 1051 and 1063
CE. He is also mentioned in the works of
Nasir Khusraw, another prominent Isma'ili scholar of the time, who had learned under al-Mu'ayyad. In a poem written in 455/1063 (Diwan, 173–177) Nasir praises al-Mua-yyad as his master (teacher) and refers to him as the "Warden of the Gate" ('Bab'). There are other direct references in Nasir's Diwan (313–314). Al-Mu'ayyad also taught
Hassan-i Sabbah. ==Works==