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Commentaries on Aristotle refers to the great mass of literature produced, especially in the ancient and medieval world, to explain and clarify the works of Aristotle. The pupils of Aristotle were the first to comment on his writings, a tradition which was continued by the Peripatetic school throughout the Hellenistic period and the Roman era. The Neoplatonists of the late Roman empire wrote many commentaries on Aristotle, attempting to incorporate him into their philosophy. Although Ancient Greek commentaries are considered the most useful, commentaries continued to be written by the Christian scholars of the Byzantine Empire, and by the many Islamic philosophers and Western scholastics who had inherited his texts.
Greek commentators 
The first pupils of Aristotle commentated on his writings, but often with a view to expand his work. Thus Theophrastus invented five moods of syllogism in the first figure, in addition to the four invented by Aristotle, and stated with additional accuracy the rules of hypothetical syllogisms. He also often differed with his master, including in collecting much information concerning animals and natural events, which Aristotle had omitted.
During the early Roman empire we find few celebrated names among the Peripatetic philosophers. Nicolaus of Damascus wrote several treatises on the philosophy of Aristotle; and Alexander of Aegae also wrote commentaries on Aristotle. The earliest commentaries which survive, are those written in the 2nd century by Adrastus and Aspasius. Alexander of Aphrodisias (c. 200) was regarded by subsequent Aristotelians among the Greeks, Latins, and Muslims, as the best interpreter of Aristotle. On account of the number and value of his commentaries, he was called, by way of distinction, "The Commentator". Several of his works are still extant, among which is a treatise On Fate, wherein he supports the doctrine of divine providence.
Many of the Neoplatonists undertook to explain and illustrate the writings of Aristotle, particularly on the subject of dialectics, which Plato had left imperfect. Porphyry (3rd century) wrote a book on the Categories, which was found to be so suitable a complement to the Categories of Aristotle, that it was usually prefixed to that treatise. Porphyry sought to show that Plato and Aristotle were in harmony with each other, especially in regards to the compatibility of Aristotle's Categories with Plato's Theory of Forms. Porphyry's pupil Iamblichus continued this process of harmonising Plato and Aristotle, and Dexippus, a disciple of Iamblichus, wrote a Reply to the Objections of Plotinus against Aristotle's Categories, which is still extant. Themistius (4th century), who taught at Constantinople with great success, paraphrased several of the works of Aristotle, particularly the Posterior Analytics, the Physics, and the book On the Soul. In the 5th century, Ammonius Hermiae represented Plato and Aristotle in agreeing that god was the artificier of a beginningless universe. Olympiodorus, an Alexandrian philosopher, wrote commentaries upon Aristotle's Meteorology and Categories. Simplicius of Cilicia (6th century) wrote extensive commentaries upon Aristotle, and, like many of the other Neoplatonists, attempted to reconcile the doctrines of the Pythagoreans, of the Eleatics, of Plato, and of the Stoics, with those of Aristotle. He also strenuously defended Aristotle's doctrine concerning the eternity of the world.
In the 6th century, Boethius, whose commentaries on the logical works of Aristotle became the only commentaries in Latin available to the West, entertained the design of translating into Latin the whole of Aristotle's and Plato's works, and of showing their agreement; a gigantic plan, which he never executed. Others employed themselves in disentangling the confusion which such attempts produced, as John Philoponus, who, in the sixth century, maintained that Aristotle was entirely misunderstood by Porphyry and Proclus in incorporating his doctrines into those of the Neoplatonists, or even in reconciling him with Plato himself on the subject of ideas, offering instead a Christian interpretation of the Aristotelian corpus. Others, again, wrote epitomes, compounds, abstracts; and tried to throw the works of Aristotle into some simpler and more obviously regular form, as John of Damascus, in the middle of the 8th century, who made abstracts of some of Aristotle's works, and introduced the study of the author into theological education. John of Damascus lived under the patronage of the Arabs, and was at first secretary to the Caliph, but afterwards withdrew to a monastery.
Islamic commentators 
In the 9th century, the Platonising school of Thābit ibn Qurra in Baghdad translated Aristotle and his commentators into Arabic. Islamic scholars made a point of studying the writings of Aristotle, especially his metaphysical and logical writings, and also of his Physics. They wrote commentaries on Aristotle, and developed still further the abstract logical element. Many of these commentaries are still extant.
Al-Kindi, who wrote a commentary on Aristotelian logic, lived in the 9th century, under Al-Ma'mun. Al-Farabi (10th century) wrote commentaries on Aristotle's Organon, which were made diligent use of by the Scholastics. It is related of him that he read through Aristotle's treatise On Hearing forty times, and his Rhetoric two hundred times, without getting at all tired of them. The physicians made a study of philosophy, and formulated theories; among them was Avicenna (c. 980-1037), who came from Bukhara, to the east of the Caspian Sea; he wrote a commentary on Aristotle. Al-Ghazali (1058–1111) wrote compendiums of logic and metaphysics. Averroes (1126–1198) was especially distinguished as a commentator of Aristotle. He often wrote two or three different commentaries on the same work, and some 38 commentaries by Averroes on the works of Aristotle have been identified. Although his writings had only marginal impact in Islamic countries, his works had a huge impact in the Latin West following the Latin translations of the 12th and 13th centuries.
Byzantine commentators 
The line of the Aristotelian commentators was continued to the later ages of the Byzantine Empire. In the 12th century Anna Comnena organised a group of scholars which included the commentators Michael of Ephesus, and Eustratius of Nicaea who employed himself upon the dialectic and moral treatises, and whom she does not hesitate to elevate above the Stoics and Platonists for his talent in philosophical discussions. Nicephorus Blemmydes wrote logical and physical epitomes for the use of John Ducas; George Pachymeres composed an epitome of the philosophy of Aristotle, and a compendium of his logic: Theodore Metochites, who was famous in his time for his eloquence and his learning, has left a paraphrase of the books of Aristotle on Physics, On the Soul, On the Heavens, etc. The same period saw the commentaries and paraphrases of Sophonias.
Commentators in the Latin West 
Scholastic philosophy in the Latin West was decisively shaped when the works of Aristotle became widely available, at first through translations of commentators and their basis texts from Arabic, and later through translations from Greek of Aristotle's original text (notably by William of Moerbeke) and of the Greek commentators. Albertus Magnus, Thomas Aquinas, Duns Scotus, and William of Ockham, among many others, wrote important philosophical works in the form of Aristotelian commentaries.
Lists and indices of commentaries on Aristotle 
A list of Medieval and Renaissance commentaries on all of Aristotle's works has been compiled by Charles H. Lohr:
- 1967: “Medieval Aristotle Commentaries: Authors A-F”, Traditio, 23, 313-413.
- 1968: “Medieval Aristotle Commentaries: Authors G-I”, Traditio, 24, 149-245.
- 1970: "Medieval Aristotle Commentaries: Authors Jacobus-Johannes Juff", Traditio, 26, 135-216.
- 1971: "Medieval Aristotle Commentaries: Authors Johannes de Kanthi–Myngodus", Traditio, 27, 251-351.
- 1972: "Medieval Aristotle Commentaries: Authors Narcissus–Richardus", Traditio, 28, 281-396.
- 1973: "Medieval Aristotle Commentaries: Authors Robertus–Wilgelmus", Traditio, 29, 93-197.
- 1974: "Medieval Aristotle Commentaries: Supplementary Authors ", Traditio, 30, 119-144.
- 1974: "Renaissance Latin Aristotle Commentaries: Authors A-B", Studies in the Renaissance, 21, 228-289.
- 1975: "Renaissance Latin Aristotle Commentaries: Authors C", Renaissance Quarterly, 28, 689-741.
- 1976: "Renaissance Latin Aristotle Commentaries: Authors D-F", Renaissance Quarterly, 29, 714-745.
- 1977: "Renaissance Latin Aristotle Commentaries: Authors G-K", Renaissance Quarterly, 30, 681-741.
- 1978: "Renaissance Latin Aristotle Commentaries: Authors L-M", Renaissance Quarterly, 31, 532-603.
- 1979: "Renaissance Latin Aristotle Commentaries: Authors N-Ph", Renaissance Quarterly, 32, 529-580.
- 1980: "Renaissance Latin Aristotle Commentaries: Authors Pi-Sm", Renaissance Quarterly, 33, 623-374.
- 1982: "Renaissance Latin Aristotle Commentaries: Authors So-Z", Renaissance Quarterly, 35, 164-256.
- 1988: Latin Aristotle Commentaries–II: Renaissance Authors, Firenze: Leo S. Olschki.
See also 
- Ancient commentators project
- Commentaria in Aristotelem Graeca
- Commentaries on Plato
- List of writers influenced by Aristotle
- List of Renaissance commentators on Aristotle
- Brucker 1837, pages 349-53
- Whewell 1837, pages 271-5
- Sorabji 1998, pages 435-7
- Hegel 1896, pages 34-5
- Grant 1996, page 30
- Heinrich Kuhn, "Aristotelianism in the Renaissance," Stanford Encyclopedia of Philosophy accessed September 22, 2009.
- William Whewell, (1837), History of the Inductive Sciences: From the Earliest to the Present Times, pages 271-5
- Johann Jakob Brucker, (1837), The History of Philosophy, from the Earliest Periods, pages 349-53
- Georg Wilhelm Friedrich Hegel, (1896), Lectures on the History of Philosophy, Part Two. Philosophy of the Middle Ages, pages 34–35
- Edward Grant, (1996), The foundations of modern science in the Middle Ages: their religious, page 30. Cambridge University Press
- Richard Sorabji, "Aristotle Commentators" entry in Routledge Encyclopedia of Philosophy (1998)
Further reading 
- Roy K. Gibson, Christina Shuttleworth Kraus, (editors), (2002), The Classical Commentary: Histories, Practices, Theory. Brill
- Lloyd A. Newton (ed), Medieval Commentaries on Aristotle's Categories (Leiden, Brill, 2008) (Brill's Companions to the Christian Tradition, 10).
- Richard Sorabji (editor), (1990), Aristotle Transformed: The Ancient Commentators and their Influence. Duckworth
- Richard Sorabji, (2005), The Philosophy of the Commentators 200-600 AD. A Sourcebook. Cornell University Press (3 volumes)
- Miira Tuominen, The Ancient Commentators on Plato and Aristotle (Durham, Acumen, 2009).
- Commentators on Aristotle entry by Andrea Falcon in the Stanford Encyclopedia of Philosophy
- A bibliographical guide to the Aristotelian commentators (PDF)
- The Neoplatonic Commentators on Aristotle's Metaphysics with an annotated bibliography on the Ancient Greek Commentators
- The Stoic Theory of Categories and Plotinus' Criticism of Aristotle
- Ancient Greek Commentators on Aristotle's Categories
- Latin Medieval Commentators on Aristotle's Categories