of the new converts, the Almohadis compelled them to wear a special garb, with a yellow cloth for a head-covering. Cultural heyday of Tunisian Jews. The living conditions of the Jews were relatively favorable during the reign of the Aghlabids and then Fatimids dynasties. As evidenced by the archives of the Cairo Geniza, composed between 800 and 115041, the dhimma is practically limited to the jizya. Jews worked in the service of the dynasty, as treasurers, doctors or tax collectors but their situation remained precarious. Kairouan, now the capital of the Aghlabids, was the seat of the most important community in the territory, attracting migrants from Umayyad, Italy and the Abbasid Empire. This community would become one of the major poles of Judaism between the ninth and eleventh centuries, both economically, culturally and intellectually, ensuring, through correspondence with the Talmudic Academies in Babylonia, Lessons learned from Spain. Many major figures of Judaism are associated with the city. Among them is Isaac Israeli ben Solomon, a private doctor of the Aghlabide Ziadet Allah III and then of the Fatimids Abdullah al-Mahdi Billah and Al-Qa'im bi-Amr Allah and author of various medical treatises in Arabic which would enrich the medieval medicine through their translation by Constantine the African, adapting the teachings of the Alexandrian school to the Jewish dogma. Dunash ibn Tamim, is the author (or final editor) whose discipline is a philosophical commentary on the Sefer Yetzirah, where he developed conceptions close to his master's thought. Another disciple, Ishaq ibn Imran is considered the founder of the philosophical and medical school of Ifriqiya. Jacob ben Nissim ibn Shahin, rector of the Center of Studies at the end of the tenth century, is the official representative of the Talmudic academies of Babylonia, acting as intermediaries between them and his own community. His successor Chushiel ben Elchanan, originally from Bari, developed the simultaneous study of the Talmud of Babylon and the Jerusalem Talmud. His son and disciple Chananel ben Chushiel was one of the major commentators of the Talmud in the Middle Ages. After his death, his work was continued by another disciple of his father whom Ignác Goldziher calls Jewish {Muʿtazila|mutazilite}: Nissim ben Jacob, the only one among the sages of Kairouan to bear the title of Gaon, also wrote an important commentary on the Talmud and the Hibbour yafe mehayeshoua, which is perhaps the first tales collection in Jewish literature. On