Jacob ben Nissim

Jacob ben Nissim ibn Shahin was a Jewish philosopher and mathematician who lived in Kairouan, Tunisia, in the 10th century; he was a younger contemporary of Saadia. At Jacob's request, Sherira Gaon wrote a treatise entitled Iggeret, on the redaction of the Mishnah. Jacob is credited with the authorship of an Arabic commentary on the Sefer Yeẓirah (translated into Hebrew by Moses ben Joseph).

Jacob ben Nissim ibn Shahin
יעקב בן ניסים אבן שהין
Born	10th century Kairouan, Tunisia
Died	10th century
Philosophical work
Region	Jewish philosophy
Main interests	Sefer Yeẓirah, Indian mathematics
Notable works	Commentary on Sefer Yeẓirah, Ḥisab al-Ghubar
Notable ideas	Commentary on Sefer Yeẓirah, Ḥisab al-Ghubar

He asserts in the introduction that Saadia, while living in Egypt, used to address very insignificant questions to Isaac ben Solomon of Kairouan, and that, on receiving Saadia's commentary, he found that the text had not been understood by the commentator. Jacob therefore decided to write another commentary. In the same introduction Jacob speaks of Galen, repeating the story that that celebrated physician was a Jew named "Gamaliel." The Hebrew translation of Jacob's commentary is still extant in manuscript;^[1] excerpts from it have been given by M. H. Landauer and Dukes.

Jacob ben Nissim wrote a work on Indian mathematics under the title Ḥisab al-Ghubar (Hebrew: האבק חשבון).

His son and student, Nissim (referred to in later Rabbinic literature as Rabbeinu Nissim, or in Hebrew רבנו ניסים), later became the head of Yeshiva at Kairouan.