|Hibatullah ibn Musa Abu Nasr al-Mu'ayyad fi d-Din ash-Shirazi|
|Born||1000 CE / 390 AH|
|Died||1078 CE / 470 AH|
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Al-Mu'ayyad fid-din Abu Nasr Hibat Allah b. Abi 'Imran Musa b. Da'ud ash-Shirazi (1000 CE/390 AH - 1078 "CE/470 AH) was an 11th-century "Isma'ilism scholar, philosopher-poet, preacher and theologian of "Persian origin. He served the "Fatimid Caliph-"Imām "al-Mustansir Billah as a "Da'i in varying capacities, eventually attaining the highest rank of Bab al-Abwab "The Gate of Gates" and Da‘i al-Du‘at "Chief Missionary" in the Fatimid "Da‘wah. In his theological and philosophical writings he brought the Isma'ili spiritual heritage to its pinnacle.
Al-Mu'ayyad was born in Shiraz not later than 387/997 and died in Cairo Shawwal,470 AH/ 1078 AD. He lived during the time of the Fatimid Caliphs Al-Hakim (386-412 AH/ 996-1021 AD), Az-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 Yaman and the advent of the Armnenian General "Badr al-Jamali in Egypt".
During the reign of the Fatimid Caliph-Imam "Ali az-Zahir, 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. In this position, he worked at the "Dar al-'Ilm "House of Knowledge" teaching missionaries from both inside and outside the Fatimid Empire and composing his theological works until the end of his life in 1078 "CE.
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).
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