The increased sense of linguistic and national identity and the religious movements of the 5th and 6th centuries such as Nestorianism (a doctrine that so stressed the distinction between the divine and human natures of Jesus as to suggest that they belonged to two persons) and miaphysitism (a doctrine asserting that Jesus has a single nature) led to the foundation of Syriac centres of studies in the Persian and Byzantine empires, especially at Edessa (now Urfa, Turkey) and Antioch. Proba and Sergius of Resaina were among those who contributed, through translations of the basic logical texts and commentaries on them, to the establishment of Aristotelian studies in these centres. At the time of the Arabic invasion of the Byzantine and Sāsānian empires about 640, and for several generations afterward, these centres continued to grow in importance. Most notable was the great school of Kinnesrin, which was represented by such figures as Severus Sebokht, who wrote on Aristotle’s syllogisms; Jacob, bishop of Edessa, a theologian, grammarian, and translator; and Georgius, bishop of the Arabs, author of a commentary on the Organon. Interest remained, however, mainly confined to logic and its application to theology.

The Syrian Christians formed the philosophical and scientific intelligentsia when in the 9th century al-Maʿmūn, the seventh ʿAbbāsid caliph, organized the Arabic centre of learning of the new Islamic empire in Baghdad. By then the Syrian scholars had acquired and translated most of Aristotle’s works. They also then translated them into Arabic, both from the Syriac and directly from the Greek, and added many texts of commentators on Aristotle. In this way Ḥunayn ibn Isḥāq, his son Isḥāq, Abū Bishr Mattā ibn Yūnus, Yaḥyā ibn ʿAdī, and many other Syrians provided the basis for a brilliant philosophical activity in Arabic. The Syrians retained their own independent culture; as late as the 13th century their language was used by the converted Jew Bar Hebraeus (“Son of the Hebrew”; also known as Gregorius or Abū al-Faraj), an encyclopaedist, philosopher, and theologian, who expounded all the works of Aristotle in his Kěthabhā dhē-ḥēwath ḥekhměthā (Book of the Cream of Wisdom), elaborating many sections on the basis of the Greek and Arabic Aristotelians.

In the 9th century the Arab al-Kindī was the first notable scholar to use the Arabic language in a general introduction of mainly Aristotelian philosophy. In the following century the Turkish Muslim al-Fārābī produced a more specialized study in which he commented upon and expounded the books of logic and attempted to establish the relationship between philosophy and Islam. It was through the writings of Avicenna and Averroës, however, that Aristotle’s thought became an integral part of lay Arabic culture.

Early in the 11th century, the Arab Avicenna (Ibn Sīnā) made Aristotle’s philosophy the foundation of an original system of his own. For this he also found inspiration in a group of Plotinian texts that had been translated into Arabic under the title “Theology of Aristotle.” Aristotle became, in Avicenna’s hands, a much more systematic and coherent thinker than he really had intended to be; problems and solutions that were, at best, hinted at by Aristotle (e.g., the distinction between essence and existence or the relation between possible and necessary existence) were among the distinctive marks of Avicenna’s own work.

For the Spanish Arab Averroës (Ibn Rushd) in the 12th century, Aristotle was “the measure and model offered by nature to show the ultimate perfection of man.” He held that philosophy, specifically Aristotelian philosophy, was and taught truth; revelation or revealed religion was a debased philosophy for the simple. Averroës dissected Aristotle’s works, analyzing and reconstructing them with a fine scholarly and philosophical sense and an incredible wealth of information derived from previous Greek and Arabic philosophers. He elicited doctrines that are not easily apparent and made them in some cases more compelling than the texts themselves might allow, but he rarely forced his own views onto Aristotle without at least finding some support in the texts themselves. The doctrines concerning the mortality of the individual soul, the eternity of the world, and the existence of a single Mind for the whole human race to the exclusion of individual minds were key doctrines for Averroës; they had some basis—but not much—in the thought of Aristotle.

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Judaism: Jewish Aristotelianism

Until the 13th century, Jewish Aristotelianism developed within the Arabic culture of North Africa, Mesopotamia, and Spain. This work was carried out in the Arabic language and distinguished itself for its almost constant concern with the relation between philosophy and Judaism. Many Aristotelian concepts were considered and discussed by Isaac ben Solomon Israeli, a 10th-century Neoplatonist, in his Kitāb al-ḥudūd (“Book of Definitions”) and Kitāb al-usṭuqusāt (“Book of the Elements”). Form and matter were the basis of the metaphysical structure of the Neoplatonic system of Solomon ibn Gabirol, an 11th-century poet and philosopher known as Avicebron. A fully conscious plan of inserting Aristotle—or at least the Aristotle of al-Fārābī and Avicenna—into the intellectual and spiritual life of Judaism was carried out by Abraham ibn Daud of Toledo in the mid-12th century. Moses Maimonides of Córdoba found a way of reconciling the claims of empirical knowledge with those of revelation, which places him into clear contrast with his contemporary Spaniard Averroës, and in so doing he provided a Jewish anticipation of Aquinas’s Christian compromise. His proofs for the existence of God and his acceptance of a theory of creation from eternity were typical of his approach. From the 13th century onward philosophical works, particularly those of Averroës on Aristotle, were being translated into Hebrew; a vast Hebrew literature of “super-commentaries” (those on the works of Aristotle as commented on by Averroës) appeared, and independent works were also produced, notably by Levi ben Gershom (Gersonides), who was faithful to both Maimonides and Averroës. Soon after, however, the more orthodox tradition based upon the Bible and the Talmud prevailed. Aristotelian works by Jews and Hebrew versions of Averroës, translated into Latin, contributed their share to the Italian philosophical movement of the 16th century (see also Judaism: Jewish philosophy).