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Abū 'l-Walīd Muḥammad ibn Aḥmad ibn Rushd (Arabic:أبو الوليد محمد بن احمد بن رشد), better known just as Ibn Rushd (Arabic: ابن رشد), and in European literature as Averroes (pronounced /ə'vɛrəʊiz/) (1126 – December 10, 1198), was a Muslim Andalusian philosopher, physician, and polymath: a master of philosophy, theology, Maliki law and jurisprudence, astronomy, geography, mathematics, medicine, physics, psychology and science. He was born in Córdoba, modern day Spain, and died in Marrakech, modern day Morocco. His school of philosophy is known as Averroism. He has been described as the founding father of secular thought in Western Europe.[2] His name is also seen as Averroës, Averroès or Averrhoës, indicating that the o and the e form separate syllables. Averroes is a Latinate distortion of the actual Arab name Ibn Rushd.[3]
[edit] BiographyIbn Rushd came from a family of legal scholars; his grandfather Abu Al-Walid Muhammad (d. 1126) was chief judge of Cordoba under the Almoravid dynasty. His father, Abu Al-Qasim Ahmad, held the same position until the coming of the Almohad dynasty in 1146. It was Ibn Tufail ("Aben Tofail" to the West), the author of Hayy ibn Yaqdhan and philosophic vizier of Almohad Caliph Abu Yaqub Yusuf, who introduced Averroes (Ibn Rushd) to the court and to Ibn Zuhr ("Avenzoar" in the West), the great Muslim physician; both men became friends. Averroes later reported how it was Ibn Tufail that inspired him to write his famous Aristotelian commentaries:
In 1160 Ibn Rushd (Averroes) was made Qadi of Seville and he served in many court appointments in Seville and Cordoba, and in Morocco during his career. At the end of the 12th century, following the Almohads conquest of Al-Andalus, his political career was ended. Averroes' strictly rationalist views which collided with the more orthodox Islamic views of Abu Yusuf Ya'qub al-Mansur led to him banishing Averroes though he had previously appointed him as his personal physician. Averroes was not rehabilitated until shortly before his death. He devoted the rest of his life to his philosophical writings. [edit] WorksHe wrote commentaries on most of the surviving works of Aristotle. These were not based on primary sources (it is not known whether he knew Greek), but rather on Arabic translations. There were three levels of commentary: the Jami, the Talkhis and the Tafsir which are, respectively, a simplified overview, an intermediate commentary with more critical material, and an advanced study of Aristotelian thought in a Muslim context. The terms are taken from the names of different types of commentary on the Qur'an. It is not known whether he wrote commentaries of all three types on all the works: in most cases only one or two commentaries survive. He did not have access to any text of Aristotle's Politics. As a substitute for this, he commented on Plato's Republic, arguing that the state there described was the same as the original constitution of the Arabs and was rediscovered in the Almohad state of Ibn Tumart. His most important original philosophical work was The Incoherence of the Incoherence (Tahafut al-tahafut), in which he defended Aristotelian philosophy against al-Ghazali's claims in The Incoherence of the Philosophers (Tahafut al-falasifa). Al-Ghazali argued that Aristotelianism, especially as presented in the writings of Avicenna, was self-contradictory and an affront to the teachings of Islam. Averroes' rebuttal was two-pronged: he contended both that al-Ghazali's arguments were mistaken and that, in any case, the system of Avicenna was a distortion of genuine Aristotelianism so that al-Ghazali was aiming at the wrong target. Other works were the Fasl al-Maqal, which argued for the legality of philosophical investigation under Islamic law, and the Kitab al-Kashf, which argued against the proofs of Islam advanced by the Ash'arite school and discussed what proofs, on the popular level, should be used instead. Averroes is also a highly-regarded legal scholar of the Maliki school. Perhaps his best-known work in this field is Bidāyat al-Mujtahid wa Nihāyat al-Muqtaṣid ( بدايات المجتهد و نهايات المقتصد), a textbook of Maliki doctrine in a comparative framework. He is also the author of al-Bayān wa’l-Taḥṣīl, wa’l-Sharḥ wa’l-Tawjīh wa’l-Ta`līl fi Masā’il al-Mustakhraja, a long and detailed commentary based on the Mustakhraja of Muḥammad al-`Utbī al-Qurtubī. In medicine, Averroes wrote a medical encyclopedia called Kulliyat ("Generalities", i.e. general medicine), known in its Latin translation as Colliget. He also made a compilation of the works of Galen (129-200) and wrote a commentary on The Canon of Medicine (Qanun fi 't-tibb) of Avicenna (Ibn Sina) (980-1037). Jacob Anatoli translated several of the works of Averroes from Arabic into Hebrew in the 1200s. Many of them were later translated from Hebrew into Latin by Jacob Mantino and Abraham de Balmes. Other works were translated directly from Arabic into Latin by Michael Scot. Many of his works in logic and metaphysics have been permanently lost, while others, including some of the longer Aristotelian commentaries, have only survived in Latin or Hebrew translation, not in the original Arabic. The fullest version of his works is in Latin, and forms part of the multi-volume Juntine edition of Aristotle published in Venice 1562-1574. [edit] Contributions[edit] Philosophy
According to him, there is no conflict between religion and philosophy, rather that they are different ways of reaching the same truth. He believed in the eternity of the universe. He also held that the soul is divided into two parts, one individual and one divine; while the individual soul is not eternal, all humans at the basic level share one and the same divine soul. Averroes has two kinds of Knowledge of Truth. The first being his knowledge of truth of religion being based in faith and thus could not be tested, nor did it require training to understand. The second knowledge of truth is philosophy, which was reserved for an elite few who had the intellectual capacity to undertake this study. The concept of "existence precedes essence", a key foundational concept of existentialism, can also be found in the works of Averroes, as a reaction to Avicenna's concept of "essence precedes existence".[6] [edit] PsychologyH. Chad Hillier writes the following on Averroes' contributions to psychology:[7]
[edit] AstronomyIn astronomy, Averroes rejected the eccentric deferents introduced by Ptolemy. He rejected the Ptolemaic model and instead argued for a strictly concentric model of the universe. He wrote the following criticism on the Ptolemaic model of planetary motion:[8]
Averroes also argued that the Moon is opaque and obscure, and has some parts which are thicker than others, with the thicker parts receiving more light from the Sun than the thinner parts of the Moon.[9] He also gave one of the first descriptions on sunspots.[10] [edit] Celestial mechanics
In celestial mechanics, while discussing the celestial spheres, Averroes rejected John Philoponus' 'anti-Aristotelian' solution to his refutation of Aristotelian celestial dynamics, and instead restored Aristotle's law of motion by adopting the 'hidden variable' approach to resolving apparent refutations of parametric laws that posits a previously unaccounted variable and its value(s) for some parameter, thereby modifying the predicted value of the subject variable. For he posited a non-gravitational previously unaccounted inherent resistance to motion hidden within the celestial spheres. This was a non-gravitational inherent resistance to motion of superlunary quintessential matter, whereby R > 0 even when there is neither any gravitational nor any media resistance to motion. Hence the alternative logic of Averroes' solution to the refutation of the prediction of Aristotelian celestial dynamics [ (i) v α F/R & (ii) F > 0 & (iii) R = 0 ] entail v is infinite was to reject its third premise R = 0 instead of rejecting its first premise as Philoponus had. Thus Averroes most significantly revised Aristotle's law of motion v α F/R into v α F/M for the case of celestial motion with his auxiliary theory of what may be called celestial inertia M, whereby R = M > 0. But Averroes restricted inertia to celestial bodies and denied sublunar bodies have any inherent resistance to motion other than their gravitational (or levitational) inherent resistance to violent motion, just as in Aristotle's original sublunar physics. However, Averroes’ 13th century follower Thomas Aquinas rejected this denial of sublunar inertia and extended Averroes' innovation in the celestial physics of the spheres to all sublunar bodies. He posited all bodies universally have a non-gravitational inherent resistance to motion constituted by their magnitude or mass.[11] In his Systeme du Monde, the pioneering historian of medieval science Pierre Duhem, stated:
Some five centuries after Averroes' and Aquinas' innovations, it was Johannes Kepler who first dubbed this non-gravitational inherent resistance to motion in all bodies universally 'inertia'.[13] Hence the crucial notion of 17th century early classical mechanics of a resistant force of inertia inherent in all bodies was born in the heavens of medieval astrophysics, in the Aristotelian physics of the celestial spheres, rather than in terrestrial physics or in experiments.[14] However, having discounted the possibility of any resistance due to a contrary inclination to move in any opposite direction or due to any external resistance, in concluding their impetus was therefore not corrupted by any resistance Buridan also discounted any inherent resistance to motion in the form of an inclination to rest within the spheres themselves, such as the inertia posited by Averroes and Aquinas. For otherwise that resistance would destroy their impetus, as the anti-Duhemian historian of science Annaliese Maier maintained the Parisian impetus dynamicists were forced to conclude because of their belief in an inherent inclinatio ad quietem (tendency to rest) or inertia in all bodies.[15] But in fact contrary to that inertial variant of Aristotelian dynamics, according to Buridan prime matter does not resist motion.[16] [edit] LogicAverroes was the last major Muslim logician from al-Andalus. He is known for writing the most elaborate commentaries on Aristotelian logic.[17] [edit] MedicineIn medicine, Averroes discussed the topic of human dissection and autopsy. Although he never undertook human dissection, he was aware of it being carried out by some of his contemporaries, such as Ibn Zuhr (Avenzoar), and appears to have supported the practice. Averroes stated that the "practice of dissection strengthens the faith"[18] due to his view of the human body as "the remarkable handiwork of God in his creation."[19] Despite his criticism of Al-Ghazali's theological views, Averroes agreed with him on the issue of anatomy and dissection, and wrote:[20]
In urology, Averroes identified the issues of sexual dysfunction and erectile dysfunction, and was among the first to prescribe medication for the treatment of these problems. He used several methods of therapy for this issue, including the single drug method where a tested drug is prescribed, and a "combination method of either a drug or food." Most of these drugs were oral medication, though a few patients were also treated through topical or transurethral means.[21] In neurology and neuroscience, Averroes suggested the existence of Parkinson's disease, and in ophthalmology and optics, he was the first to attribute photoreceptor properties to the retina.[22] In his Coliget, he was also the first to suggest that the principal organ of sight might be the arachnoid membrane (aranea). His work led to much discussion in 16th century Europe over whether the principal organ of sight is the traditional Galenic crystalline humour or the Averroist aranea, which in turn led to the discovery that the retina is the principal organ of sight.[23] [edit] PhysicsIn Averroes' commentary on Aristotle's Physics, he commented on the theory of motion proposed by Ibn Bajjah (Avempace) in Text 71, and also made his own contributions to physics, particularly mechanics. Averroes was the first to define and measure force as "the rate at which work is done in changing the kinetic condition of a material body"[24] and the first to correctly argue "that the effect and measure of force is change in the kinetic condition of a materially resistant mass."[25] It seems he was also the first to introduce the notion that bodies have a (non-gravitational) inherent resistance to motion into physics, subsequently first dubbed 'inertia' by Kepler. But he only attributed it to the superlunary celestial spheres, and in order to explain why they do not move with infinite speed as was predicted by the application of Aristotle's general law of motion v α F/R to celestial motion, given the assumption that the spheres have movers and thus F > 0, but no resistance to their motion, whereby R = 0. [26] John Philoponus had earlier rejected Aristotle's theory of motion because of this celestial empirical refutation in favour of his alternative theory v α F - R that avoided it because v is finite even when R = 0 and when F > 0 and is finite. But contra Philoponus, Averroes restored it by positing inertia instead, whereby R > 0 even in the absence of any external resistance to motion and of any inherent gravitational resistance, as in the quintessential heavens in Aristotelian cosmology. But Averroes denied sublunar bodies have inertia, and it was his follower Thomas Aquinas who extended this inherent force to terrestrial bodies as well, thus also rejecting Aristotle's prediction that the speed of gravitational fall of all bodies in a vacuum would be infinite because there would be no resistance to motion in the absence of an external resistant medium (i.e. R = 0). For Aristotle had assumed the only inherent resistance to motion in bodies is that of gravity, without which bodies would not inherently resist any motion, and which does not resist gravitational (i.e. 'natural') motion where it acts as the motor rather than as a brake as it does in violent motion. The Averroes-Aquinas notion of inertia was eventually adopted by Kepler, but not by scholastic Aristotelian impetus dynamics nor Galileo Galilei who maintained like Jean Buridan, for example, that prime matter does not inherently resist any motion and so is indifferent to motion or rest. It eventually became the central concept of Newton's dynamics in its notion of the inherent force of inertia in all bodies, with the minor revision that the force of inertia resists all motion except for uniform straight motion, a purely fictitious ideal motion whose perseverance it would cause. But Newton's inherent force of inertia resists all actual motion, given it is all accelerated motion in the Newtonian cosmos populated by many gravitationally attractive massive bodies. Thus on this analysis Averroes is creditable with one of the two most crucial innovations in the history of the development of Aristotelian dynamics into Newtonian dynamics, namely its two auxiliary notions of the force of impetus and of the force of inertia. [edit] Significance
Averroes is most famous for his translations and commentaries of Aristotle's works, which had been mostly forgotten in the West. Before 1150, only a few translated works of Aristotle existed in Latin Europe, and they were not studied much or given much credence by monastic scholars. It was through the Latin translations of Averroes's work beginning in the 12th century that the legacy of Aristotle became more widely known in the medieval West. Averroes' argument in The Decisive Treatise provided a justification for the emancipation of science and philosophy from official Ash'ari theology, thus some writers regard Averroism as a precursor to modern secularism,[27][28] and describe Averroes as the founding father of secular thought in Western Europe.[2] George Sarton, the father of the history of science, writes:
Averroes's work on Aristotle spans almost three decades, and he wrote commentaries on almost all of Aristotle's work except for Aristotle's Politics, to which he did not have access. Averroes greatly influenced philosophy in the Islamic world. His death coincides with a change in the culture of Al-Andalus. In his work Fasl al-Maqāl (translated a. o. as The Decisive Treatise), he stresses the importance of analytical thinking as a prerequisite to interpret the Qur'an; this is in contrast to orthodox Ash'ari theology, where the emphasis is less on analytical thinking but on extensive knowledge of sources other than the Qur'an, i.e. the hadith. Hebrew translations of his work also had a lasting impact on Jewish philosophy, in particular Gersonides, who wrote supercommentaries on many of the works. In the Christian world, his ideas were assimilated by Siger of Brabant and Thomas Aquinas and others (especially in the University of Paris) within the Christian scholastic tradition which valued Aristotelian logic. Famous scholastics such as Aquinas believed him to be so important they did not refer to him by name, simply calling him "The Commentator" and calling Aristotle "The Philosopher." Averroes's treatise on Plato's Republic has played a major role in both the transmission and the adaptation of the Platonic tradition in the West. It has been a primary source in medieval political philosophy. On the other hand he was feared by many Christian theologians, who accused him of advocating a "double truth" and denying orthodox doctrines such as individual immortality, and an underground mythology grew up stigmatising him as the ultimate unbeliever; these accusations were largely based on misunderstandings of his work.[30] A later importation of Averroism into Europe is associated with the University of Padua in the early Renaissance, important names being Zabarella, Cremonini and Niphus. [edit] Cultural influences
Reflecting the respect which medieval European scholars paid to him, Averroes is named by Dante in The Divine Comedy with the great pagan philosophers whose spirits dwell in "the place that favor owes to fame" in Limbo. Averroes appears in a short story by Jorge Luis Borges, entitled "Averroes's Search", in which he is portrayed trying to find the meanings of the words tragedy and comedy. He is briefly mentioned in the novel Ulysses by James Joyce alongside Maimonides. He appears to be waiting outside the walls of the ancient city of Cordoba in Alamgir Hashmi's poem In Cordoba. He is also the main character in Destiny, a Youssef Chahine film. The asteroid "8318 Averroes" was named in his honor. [edit] List of Works[edit] Logic[edit] Short Commentary[1] Short Commentary on Aristotle's Organon / Tajrīd al-ʾaqāwīl al-ḍarūrīya min ṣināʿat al-manṭiq (Aka: Al-ḍarūrī; Al-ḍarūrī fī l-manṭiq; Kitāb fī l-manṭiq; Muḫtaṣar fī l-manṭiq) ca. 552/1157 [edit] Middle Commentaries[2] Middle Commentary on the Isagoge / Talḫīṣ madḫal fī Fūrfūrīyūš (Aka: Talḥīṣ kitāb ʾĪsāġūjī) [edit] Long Commentaries[11] Long Commentary on the Prior Analytics (?) / Šarḥ kitāb al-qiyās li-ʾArisṭūṭālīs (Aka: Kitāb šarḥ kitāb al-qiyās li-ʾArisṭū) [edit] Questions[13] Questions on Logic / Quæsita in libros logicæ Aristotelis (Part of: Masāʿil fī l-ḥikma, aka: Muqaddimāt fī l-ḥikma) [edit] Questions on the Isagoge[13.1] On Alfarabi on the Isagoge about genus and differentia / Kalām ʿalā qawl ʾAbī Naṣr fī l-madḫal wa-l-jins wa-l-faṣl yuštarikān [edit] Questions on the Categories[13.2] On substantial and accidental universals / Al-qawl fī kullīyāt al-jawhar wa-kullīyāt al-ʾaʿraḍ (Aka: Bāb ʿalā maqūla ʾawwal kitāb ʾAbī Naṣr (?), Maqāla ʿalā ʾawwal maqūla ʾAbī Naṣr (?)) [edit] Questions on Peri hermeneias[13.3] On the copula and on derived nouns / Maqāla fī l-kalima wa-l-ism al-muštaqq (Aka: Kalām lahū ʿalā l-kalima wa-l-ism al-muštaqq, Min kitāb al-ʿibāra li-ʾAbī Naṣr) [13.4] On compound and simple predicates / Min kitāb al-ʿibāra (Aka: De prædicatis compositis et divisis) [edit] Questions on the Prior Analytics[13.5] On the definition: Critique of the positions of Alexander and Alfarabi / Al-qawl fī l-ḥadd wa-naqd mā ḏahaba ʾilayhī al-ʾIskandar wa-ʾAbū Naṣr (Aka: Maqāla fī l-ḥadd (juzʾ al-qiyās) wa-naqd maḏahabay al-ʾIskandar wa-ʾAbī Naṣr; De definitione termini) [edit] Questions on the Posterior Analytics[13.16] On the predicates in demonstrations / Al-qawl fī l-maḥmūlāt al-barāhīn (Aka: Epistola de primitate prædicatorum in demonstrationibus) [edit] Philosophy of Nature[edit] Physics[14] Short Commentary on the Physics / Jawāmiʿ al-samāʾ al-ṭabīʿī (Part of: Al-jawāmiʿ fī l-falsafa; Jawāmiʿ kutub ʾArisṭūṭālīs fī l-ṭabīʿīyāt wa-l-ʾilāhīyāt) [edit] On the Heaven[17] Short Commentary on De cælo / Jawāmiʿ al-samāʾ wa-l-ʿālam (Part of: Al-jawāmiʿ fī l-falsafa; Jawāmiʿ kutub ʾArisṭūṭālīs fī l-ṭabīʿīyāt wa-l-ʾilāhīyāt) [edit] On Generation and Corruption[21] Short Commentary on De generatione et corruptione / Jawāmiʿ kitāb al-kaun wa-l-fasād (Part of: Al-jawāmiʿ fī l-falsafa; Jawāmiʿ kutub ʾArisṭūṭālīs fī l-ṭabīʿīyāt wa-l-ʾilāhīyāt) [edit] Meteorology[23] Short Commentary on the Meteorology / Jawāmiʿ kitāb al-ʾaṯār al-ʿulwīya (Part of: Al-jawāmiʿ fī l-falsafa; Jawāmiʿ kutub ʾArisṭūṭālīs fī l-ṭabīʿīyāt wa-l-ʾilāhīyāt) [edit] Biology[25] Middle(?) Commentary on De animalibus / Talḫīṣ tisʿ maqālāt min kitāb al-ḥayawān (Aka: Talḫīṣ tisʿ maqālāt min kitāb al-ḥayawān wa-ḏālika min al-ḥādīya ʿašr ʾilā ʾāḫar al-diwān; Talḫīṣ fī l-maqāla al-ḥādīya ʿašara min kitāb al-ḥayawān li-ʾArisṭūṭālīs wa-ḏālika tisʿ maqālāt; Kitāb al-ḥayawān) 565/1169 [edit] Questions[28] Questions on the Philosophy of Nature / Sefer ha-derušim ha-ṭibʿiyim [edit] Psychology[edit] Commentaries[29] "Book on the Soul" or Short Commentary on De anima / Kitāb al-nafs [edit] Treatises on the Intellect[33] Enquiry whether the intellect in us, named the material intellect, is able to know in the end the separate forms or not =Epistle on the possibility of conjunction / Kitāb fī l-faḥṣ hal yumkin al-ʿaql ʾallaḏī fīnā wa-huwa al-musammā bi-l-hayūlānī ʾan yaʿqila al-ṣuwar al-mufāriqa bi-ʾāḫirihī ʾau lā yumkin ḏālika wa-huwa al-maṭlūb ʾallaḏī kāna ʾArisṭūṭālīs waʿadanā bi-l-faḥṣ ʿanhū fī kitāb al-nafs (Aka: ʾIggeret ʾefšarut ha-debequt) [edit] ʿAbd Allāh Ibn Rušd (Son of Averroes)[39] On whether the active intellect unites with the material intellect whilst it is clothed with the body / Hal yattaṣilu bi-l-ʿaql al-hayūlānī al-ʿaql al-faʿʿāl wa-huwa multabis bi-l-jism [edit] Anonymous[40] De animæ beatudine / Tractatus Aueroys de perfectione naturali intellectus secundum mentem philosophi [edit] Metaphysics[edit] Commentaries[41] Short Commentary on the Metaphysics / Jawāmiʿ kitāb mā baʿd al-ṭabīʿa (Part of: Jawāmiʿ kutub ʾArisṭūṭālīs fī l-ṭabīʿīyāt wa-l-ʾilāhīyāt; Al-gawāmiʿ fī l-falsafa) [edit] Practical Philosophy[x] Middle Commentary on the Nicomachean Ethics [edit] MathematicsEpitome of the Almagest [edit] See also[edit] Notes
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