Ahmad ibn Ibrahim al-Naysaburi
Aḥmad ibn Ibrāhı̄m al-Nı̄sābūrı̄ or al-Naysābūrı̄ (; ) was an Isma'ili scholar from Nishapur, who entered the service of the Fatimid caliphs al-Aziz Billah and al-Hakim bi-Amr Allah in Cairo. His life is relatively obscure, and is known chiefly from references in his works. Among them three stand out as highly important for Fatimid and Isma'ili history: the "Istitār al-imām", a historical work that offers unique information on the early history of the Isma'ili movement and the rise of the Fatimid Caliphate, the "Risāla al-mūjaza", which contains an exposition on  the qualities and duties of the ideal Isma'ili missionary, and the "Ithbāt al-imāma", an influential analysis of Isma'ili conceptions of the imamate, combining rationalist philosophical argument with Islamic theology. Life. Very little is known about Ahmad ibn Ibrahim al-Naysaburi's life, apart from what can be gleaned from his works. As his "nisbah" reveals, he came from Nishapur, which at the time was a major centre of Isma'ili missionary activity ("daʿwa") in Khurasan. Some of the chief Isma'ili theologians of the period, men like Muhammad al-Nasafi and Abu Yaqub al-Sijistani, and later Hamid al-Din al -Kirmani, were active thered. The Ima'ili "daʿwa" was largely tolerated by the local Samanid dynasty, and Nishapur at the time was experiencing an intellectual renaissance: the great philosopher Avicenna was a son of an Isma'ili convert, and the philosophical traditions of the time, emphasizing rationalism, are evident in al-Naysaburi's own works. Like his contemporary, Hamid al-Din al-Kirmani, and the later al-Mu'ayyad fi'l-Din al-Shirazi, al-Naysaburi left his native city and settled in Cairo, the capital of the Isma'ili Fatimid Caliphate, during the reign of Caliph al-Aziz Billah (). He remained there during  the subsequent reign of al-Hakim bi-Amr Allah (), rising to what, according to the historian Paul E. Walker, appears to have been a high-ranking position in the Isma'ili "daʿwa". It was during al-Hakim's reign that al-Naysaburi composed his works, with topics ranging from history to theology and literature. Writings. Al-Naysaburi's three main works are the "Istitār al-imām", "Risāla al-mūjaza", and "Ithbāt al-imāma", the second of which has not survived directly, but through inclusion in a later work. Section::::"Istitār al-imām". His work "Istitār al-imām wa tafarruq al-duʿāt fi’l -jazāʾir li-ṭalabih" ("[Book on the] Concealment of the Imam and the Dispersal of "Dāʿī"s in Search of Him to Different ‘Islands’"), usually shortened to "Istitār al-imām", is a significant historical source on the early history of the Isma'ili movement, the early schism that resulted in the flight of Abdullah al-Mahdi Billah, from the Isma'ili headquarters at Salamiyya, and his journey to North Africa, where he established the Fatimid Caliphate in 909. It also contains the first public version of the Fatimid dynasty's official genealogy, possibly published, as the historian Michael Brett suggests, as a reaction to  the anti-Fatimid "Baghdad Manifesto" issued by the Abbasid caliph al-Qahir in 1011. The work has been edited and published by Wladimir Ivanow in "Bulletin of the Faculty of Arts" (University of Egypt, Vol. 4, Part 2, 1936), pp. 93–107, and an English translation has been provided by the same author in his "Ismaili Tradition concerning the Rise of the Fatimids" (London, Oxford University Press, 1942), pp. 157–183. The Arabic text is also published in Suhayl Zakkar's "Akhbār al-Qarāmiṭa" (2nd edition, Damascus, 1982), pp. 111–132. Section::::"Risāla al-mūjaza". His work "al-Risāla al-mūjaza al-kāfiya fı̄  ādāb al-duʿāt" ("Brief but Sufficient Account of the Rules of Guidance for the "Dāʿī"s") contains the only Isma'ili treatise on the qualifications and attributes required for an Isma'ili missionary ("dāʿī"), and their duties and responsibilities while on mission, combining theological instruction with advice on practical matters. It is an example of "adab" ("appropriate behaviour, etiquette") literature. Written sometime between 1013 and 1015, it emphasizes the strict obedience owed by the "dāʿī" to the Caliph-Imam, and considers all other authorities illegitimate; as Michael Brett writes, his strategy aimed to "win recruits against the time when the lords of the  land would be either converted or overthrown". It is quoted in full, apart from a lost introduction, by the 12th-century Yemeni Tayyibi leader Hatim ibn Ibrahim, at the end of his own treatise "Tuḥfat al-qulūb", and has since been transmitted among the Tayyibi community, especially the Dawoodi Bohras, until the present day. A facsimile edition was published in Verena Klemm, "Die Mission des fatimidischen Agenten al-Mu’ayyad fi'ddin in Siraz" (Frankfurt, Peter Lang, 1989), pp. 205–277, and a translated critical edition by Verena Klemm and Paul E. Walker as "A Code of Conduct. A Treatise on the Etiquette  of the Fatimid Ismaili Mission" (London, 2011). Section::::"Ithbāt al-imāma". His main theological and philosophical work is the "Ithbāt al-imāma" ("Demonstration/Proof of the Imamate"), where he applies rationalist philosophy and the Platonic principle of "degrees of excellence" to underpin his theological and cosmological concepts. It was written in an atmosphere of deep crisis in the Isma'ili "daʿwa", created by Caliph al-Hakim's erratic changes in both doctrine and governance, and is an attempt to reaffirm, in the words of Brett, "the necessity of belief in the Imam as the source of knowledge and the authority for the  law". Along with the contemporary works of Abu'l-Fawaris Ahmad ibn Ya'qub ("Risāla fi’l-imāma") and al-Kirmani ("al-Maṣābiḥ fī ithbāt al-imāma"), and the earlier "Tathbīt al-imāma" written by the third Fatimid caliph, al-Mansur Billah, al-Nusaybi's work provides "an extremely important representation of the Fatimid vision of the imamate". It was published by M. Ghalib, Beirut, 1984, and in a critical edition with an English translation by Arzina R. Lalani, in "Degrees of Excellence: A Fatimid Treatise on Leadership in Islam. An Arabic Edition and English translation of Ahmad al-Naysaburi’s Kitab Ithbat  al-Imama" (London, I. B. Tauris in association with the Institute of Ismaili Studies, 2006). Other works. Other works of al-Naysaburi are the "Kitāb al-tawḥīd" ("The Book of Unity"), a theological treatise, and the "Risālā al-zāhira fī maʿrifat al-dār al-ākhīra" ("The Resplendent Treatise on the Recognition of the Abode of the Hereafter"), which deals with eschatology, but its attribution to al-Naysaburi by Ivanow has been questioned by the contemporary historian Ismail Poonawala, who ascribes it to Ahmad ibn Ibrahim al-Ya'buri al-Hamdani.