The most important work of the academy however was done by Yahya’s pupils and successors, especially _Abu Zayd Hunayn b. Ishaq al-Ibadi_ (d. 263 A.H. = A.D. 876), the Nestorian physician to whom we have already referred as translating into Syriac the chief medical authorities as well as parts of Aristotle’s Organon. After studying at Baghdad under Yahya he visited Alexandria and returned, not only with the training given at what was then the first medical school, but with a good knowledge of Greek which he employed in making translations in Syriac and Arabic. With him were associated his son Ishaq and his nephew Hubaysh. Hunayn prepared Arabic translations of Euclid; of various portions of Galen, Hippocrates, Archimedes, Apollonius, and others, as well as of the Republic, Laws, and Timæus of Plato, the Categories, Physics, and Magna Moralia of Aristotle, and the commentary of Themistius on book 30 of the Metaphysics, as well as an Arabic translation of the Bible. He also translated the spurious Mineralogy of Aristotle, which long served as one of the leading authorities on chemistry, and the medical pandects of Paul of Aegina. His son, besides original works on medicine, produced Arabic versions of the Sophist of Plato, the Metaphysics, _de anima_, _de generatione et de corruptione_, and the Hermeneutica of Aristotle which Hunayn had translated into Syriac, as well as some of the commentaries of Porphyry, Alexander of Aphrodisias, and Ammonius. A little later we find the Syrian Christian Questa b. Luqa, a native of Ba`albek, who had studied in Greece, prominent as a translator. The fourth century A.H. was the golden period of the Arabic translators, and it is worth noting that, although the work was done chiefly by Syriac speaking Christians, and inspired by Syriac tradition a very large number of the translations were made directly from the Greek, by men who had studied the language in Alexandria or Greece; very often the same scholar made Syriac and Arabic translations from the Greek text. There were also translators from the Syriac, but these usually come after the translators from the Greek. Amongst the Nestorian translators from Syriac was _Abu Bishr Matta b. Yunus_ (d. 328 A.H. = A.D. 939), who rendered into Arabic the Analytica Posteriora and the poetics of Aristotle, Alexander of Aphrodisias’ commentary on the _de generatione et de corruptione_, and Themistius’ commentary on book 30 of the Metaphysics, all from the existing Syriac versions. He was also the author of original commentaries on Aristotle’s Categories and the Isagoge of Porphyry.