Yaʿqūb ibn Killis

Description / Bio

Yaʿqūb ibn Yūsuf Ibn Killis (930–91) was a Fatimid vizier of Jewish origin. Born in Baghdad, he moved with his father to Palestine, settled in Ramla, and served as a representative of the merchants (wakīl al-tujjār) before fleeing to Egypt — according to some sources, to escape charges of mismanaging merchants' funds. He served Kāfūr al-Ikhshīdī as a financial expert and converted to Islam, reportedly after Kāfūr remarked that if Ibn Killis were a Muslim, he would be the right man to become vizier. (Christian sources place the conversion later, under the Faitmid caliph al-Muʿizz.) Forced out by the incumbent vizier, he joined the entourage of al-Muʿizz in Ifrīqiya and returned with him to Egypt in 973, becoming one of the principal architects of the Fatimid financial administration. He was appointed vizier by al-ʿAzīz in 977 (although some Arabic traditions say by al-Muʿizz), receiving the title al-wazīr al-ajall, "most illustrious vizier," in 979. He held the post, with apparently only one brief interruption in 983–84, until his death in office in 991. He apparently authored a compendium of Ismāʿīlī fiqh, and it entered the standard Fatimid curriculum in the early eleventh century. Al-Maqrīzī describes an intellectual salon (majlis) at Ibn Killis's house every Tuesday where jurists, mutakallimūn, and polemicists (ahl al-jadal) disputed in his presence alongside stipended scholars, poets, physicians, and artisans. His relations with Jews after his conversion were mixed: He employed Jewish administrators, including Menashshe b. Ibrāhīm ibn al-Qazzāz, who supervised his property in al-Shām and held government posts, but Ibn Khallikān reports that at one session of his majlis, he disparaged the Jews, enumerated the faults of their religious teachings, and argued that Muḥammad's name appears in the Torah, even though the Jews will not admit it. The anecdote is framed to rebut the claim (wa-qīla) that his adherence to Islam was merely outward show. Only one Geniza fragment mentions Ibn Killis, and it is not a document but a literary text (PGPID 41783). The absence of documentary mentions is less surprising given that Geniza documents accumulated only after 1021. In that text, the blessing after his name shows he was alive and in office when the treatise was written, fixing its date range at 979–91. B. Lewis's identification of Ibn Killis with Paltiel b. Shefaṭya, a figure mentioned in the Chronicle of Aḥimaʿaṣ, has long been recognized as untenable. See Mark R. Cohen and Sasson Somekh, "In the Court of Yaʿqūb Ibn Killis: A Fragment from the Cairo Genizah," JQR n.s. 80 (1990): 283–314.