Ibn Rushd (14 April 1126 – 11 December 1198), known in Latin as Averroes, was an Andalusian polymath and jurist with extensive expertise across numerous intellectual disciplines. These fields encompassed philosophy, theology, medicine, astronomy, physics, psychology, mathematics, neurology, Islamic jurisprudence, and linguistics. He authored over 100 books and treatises; his philosophical contributions notably feature extensive commentaries on Aristotle. Consequently, he earned the appellations "The Commentator" and "Father of Rationalism" in the Western world.
Ibn Rushd (14 April 1126 – 11 December 1198), Latinized as Averroes, was an Andalusian polymath and jurist who was proficient in a variety of intellectual fields, including philosophy, theology, medicine, astronomy, physics, psychology, mathematics, neurology, Islamic jurisprudence and law, and linguistics. The author of more than 100 books and treatises, his philosophical works include numerous commentaries on Aristotle, for which he was known in the Western world as "The Commentator" and "Father of Rationalism".
Averroes staunchly advocated for Aristotelianism, endeavoring to reinstate what he perceived as Aristotle's authentic doctrines. He actively challenged the Neoplatonist inclinations prevalent among earlier Muslim scholars, including al-Farabi and Avicenna. Furthermore, he championed the study of philosophy, defending it against critiques from Ash'ari theologians like Al-Ghazali. Averroes contended that philosophy was not only permissible within Islam but also obligatory for specific intellectual elites. He further asserted that scriptural texts should undergo allegorical interpretation whenever they seemed to conflict with conclusions derived from reason and philosophical inquiry. Within Islamic jurisprudence, he authored Bidāyat al-Mujtahid, a work examining the distinctions among Islamic legal schools and the underlying principles that generated these variations. In the medical domain, he advanced a novel theory of stroke, provided the initial description of Parkinson's disease's signs and symptoms, and potentially became the first to identify the retina as the ocular component responsible for light perception. His medical treatise, Al-Kulliyat fi al-Tibb, subsequently translated into Latin and recognized as the Colliget, served as a foundational textbook in Europe for several centuries.
Averroes's legacy within the Islamic world remained comparatively modest, attributable to both geographical and intellectual factors. Conversely, in the Western world, Averroes gained renown for his comprehensive commentaries on Aristotle, a substantial number of which were translated into Latin and Hebrew. These translations of his corpus revitalized Western European scholarly interest in Aristotle and other Greek philosophers, a domain of study largely neglected following the collapse of the Western Roman Empire. His philosophical ideas incited considerable controversy within Latin Christendom and initiated a distinct philosophical movement, Averroism, founded upon his extensive writings. His thesis on the unity of the intellect, which posited that all human beings share a singular intellect, emerged as one of the most prominent and contentious Averroist doctrines in the West. The Catholic Church formally condemned his works in 1270 and again in 1277. Despite being undermined by these condemnations and persistent critiques from Thomas Aquinas, Latin Averroism maintained a following until the sixteenth century.
Nomenclature
The complete transliterated Arabic name for Ibn Rushd is "Abū l-Walīd Muḥammad ibn ʾAḥmad Ibn Rushd". Occasionally, the appellation al-Hafid ("The Grandson") is affixed to his name, serving to differentiate him from his grandfather, who was a renowned judge and jurist. The name "Averroes" represents the Medieval Latin rendition of "Ibn Rushd", originating from the Spanish pronunciation of the original Arabic name, where "Ibn" transformed into "Aben" or "Aven". Additional European linguistic variations of his name encompass "Ibin-Ros-din", "Filius Rosadis", "Ibn-Rusid", "Ben-Raxid", "Ibn-Ruschod", "Den-Resched", "Aben-Rassad", "Aben-Rasd", "Aben-Rust", "Avenrosdy", "Avenryz", "Adveroys", "Benroist", "Avenroyth", and "Averroysta".
Biography
Early Life and Education
Limited information is available regarding Averroes's early life. Muhammad ibn Ahmad ibn Muhammad ibn Rushd was born in Córdoba on 14 April 1126 (520 AH). His family held a prominent reputation within the city due to their extensive public service, particularly in legal and religious capacities. His grandfather, Abu al-Walid Muhammad (d. 1126), served as the chief judge (qadi) of Córdoba and the imam of the Great Mosque of Córdoba during the Almoravid era. While his father, Abu al-Qasim Ahmad, did not achieve the same level of renown as his grandfather, he also held the position of chief judge until the Almoravids were supplanted by the Almohads in 1146.
Traditional biographers describe Averroes's education as exceptional, encompassing early studies in hadith (traditions of the Islamic prophet Muhammad), fiqh (jurisprudence), medicine, and theology. He received instruction in Maliki jurisprudence from al-Hafiz Abu Muhammad ibn Rizq and in hadith from Ibn Bashkuwal, a student of Averroes's grandfather. His father further educated him in jurisprudence, specifically regarding Imam Malik's magnum opus, the Muwatta, which Averroes subsequently memorized. His medical studies were conducted under Abu Jafar Jarim al-Tajail, who likely also instructed him in philosophy. Averroes was familiar with the writings of philosopher Ibn Bajjah (Avempace) and potentially had a personal acquaintance or received tutelage from him. He participated in a regular intellectual gathering in Seville, comprising philosophers, physicians, and poets, including Ibn Tufayl, Ibn Zuhr, and the future caliph Abu Yusuf Yaqub. He also engaged with the kalam theology of the Ash'ari school, though he later became a critic of it. According to his 13th-century biographer Ibn al-Abbar, Averroes demonstrated a greater inclination towards the study of law and its principles (usul) than towards hadith, excelling particularly in khilaf (disputes and controversies within Islamic jurisprudence). Ibn al-Abbar additionally noted Averroes's interest in "the sciences of the ancients," likely referring to classical Greek philosophy and sciences.
Career
By 1153, Averroes resided in Marrakesh, then the capital of the Almohad Caliphate (present-day Morocco), where he conducted astronomical observations and contributed to the Almohad initiative for establishing new colleges. His objective was to discover physical laws governing astronomical movements, moving beyond the purely mathematical laws understood at that period; however, this research did not yield success. During his time in Marrakesh, he likely encountered Ibn Tufayl, a distinguished philosopher, author of Hayy ibn Yaqdhan, and the court physician. Despite their philosophical divergences, Averroes and Ibn Tufayl developed a friendship.
In 1169, Ibn Tufayl facilitated Averroes's introduction to the Almohad caliph, Abu Yaqub Yusuf. According to a notable account by historian 'Abd al-Wahid al-Marrakushi, the caliph posed a question to Averroes concerning the eternal existence or temporal origin of the heavens. Recognizing the controversial nature of the inquiry and fearing potential repercussions from an incorrect response, Averroes initially refrained from answering. The caliph subsequently expounded upon the perspectives of Plato, Aristotle, and various Muslim philosophers regarding the subject, engaging in a discussion with Ibn Tufayl. This demonstration of erudition reassured Averroes, who then articulated his own views on the matter, thereby impressing the caliph. Averroes, in turn, was equally impressed by Abu Yaqub, later remarking on the caliph's "profuseness of learning I did not suspect."
Following this introduction, Averroes retained Abu Yaqub's favor until the caliph's death in 1184. Upon the caliph's expression of difficulty in comprehending Aristotle's writings to Ibn Tufayl, the latter suggested that Averroes undertake the task of explication. This marked the inception of Averroes's extensive commentaries on Aristotle, with his initial contributions on the subject dating back to 1169.
In the same year, Averroes received the appointment as qadi (judge) in Seville. By 1171, he assumed the role of qadi in his native city of Córdoba. In his capacity as qadi, he adjudicated cases and issued fatwas (legal opinions) grounded in religious law. His literary output intensified during this period, notwithstanding his other duties and extensive travels throughout the Almohad empire. He also utilized his travels to conduct astronomical research. A significant number of his works composed between 1169 and 1179 bear Seville as their place of composition, rather than Córdoba. In 1179, he was reappointed as qadi in Seville. In 1182, he succeeded his friend Ibn Tufayl as the court physician. Later that year, he was elevated to the position of chief qadi of Córdoba, then under the control of the Taifa of Seville, an esteemed office previously held by his grandfather.
In 1184, Caliph Abu Yaqub died and was succeeded by Abu Yusuf Yaqub. Initially, Averroes maintained royal favor, but his standing dramatically reversed in 1195. He faced various accusations and was subsequently tried by a tribunal in Córdoba. The tribunal condemned his doctrines, mandated the burning of his writings, and exiled him to Lucena, a nearby town. While early biographers suggested a potential insult to the caliph in his works as the cause for his disgrace, contemporary scholars largely attribute it to political factors. The Encyclopaedia of Islam indicates that the caliph distanced himself from Averroes to secure the allegiance of more orthodox ulema, whose support al-Mansur required for his military campaigns against Christian kingdoms. Majid Fakhry, a historian of Islamic philosophy, further noted the significant role of public pressure from traditional Maliki jurists who opposed Averroes.
After a period of several years, Averroes was reinstated at the court in Marrakesh and once again enjoyed the caliph's favor. He passed away shortly thereafter, on December 11, 1198 (corresponding to 9 Safar 595 in the Islamic calendar). His initial burial took place in North Africa. Subsequently, his remains were transported to Córdoba for a second funeral, which was attended by the future Sufi mystic and philosopher Ibn Arabi (1165–1240).
Works
Averroes was a prolific author whose works, according to Fakhry, "covered a greater variety of subjects" than those of any of his Eastern predecessors, encompassing philosophy, medicine, jurisprudence or legal theory, and linguistics. The majority of his writings consisted of commentaries on or paraphrases of Aristotle's works, which, particularly the extensive ones, frequently incorporated his original philosophical insights. French author Ernest Renan documented that Averroes produced at least 67 original works, including 28 on philosophy, 20 on medicine, 8 on law, 5 on theology, and 4 on grammar, in addition to his commentaries on most of Aristotle's corpus and his commentary on Plato's The Republic. Many of Averroes's original Arabic works have not survived, though their translations into Hebrew or Latin have. For instance, only "a tiny handful of Arabic manuscript remains" exist for his lengthy commentaries on Aristotle.
Commentaries on Aristotle
Averroes composed commentaries on nearly all of Aristotle's extant works. The sole exception was Politics, to which he lacked access, leading him to write commentaries on Plato's Republic instead. He categorized his commentaries into three types, which modern scholars have designated as short, middle, and long. Most of the short commentaries (jami) were produced early in his career and provided concise summaries of Aristotelian doctrines. The middle commentaries (talkhis) offered paraphrases designed to clarify and simplify Aristotle's original texts. These middle commentaries were likely written in response to complaints from his patron, Caliph Abu Yaqub Yusuf, regarding the difficulty of comprehending Aristotle's original writings, and to assist others facing similar challenges. The long commentaries (tafsir or sharh), which are line-by-line analyses, included the complete text of the original works alongside a detailed examination of each line. Characterized by their extensive detail and significant original thought, the long commentaries were probably not intended for a general audience. Only five of Aristotle's works received all three types of commentaries: Physics, Metaphysics, On the Soul, On the Heavens, and Posterior Analytics.
Stand-alone philosophical works
Averroes also authored independent philosophical treatises, including On the Intellect, On the Syllogism, On Conjunction with the Active Intellect, On Time, On the Heavenly Sphere, and On the Motion of the Sphere. Furthermore, he wrote several polemical works: Essay on al-Farabi's Approach to Logic, as Compared to that of Aristotle, Metaphysical Questions Dealt with in the Book of Healing by Ibn Sina, and Rebuttal of Ibn Sina's Classification of Existing Entities.
Islamic theology
Scholarly analyses, including those by Fakhry and the Encyclopaedia of Islam, identify three pivotal works as Averroes's critical contributions in this domain. The 1178 treatise, Fasl al-Maqal ("The Decisive Treatise"), posits the fundamental compatibility of Islam and philosophy. Composed in 1179, Al-Kashf 'an Manahij al-Adillah ("Exposition of the Methods of Proof") critiques Ash'arite theological doctrines and articulates Averroes's arguments for divine existence, alongside his perspectives on God's attributes and actions. The 1180 work, Tahafut at-Tahafut ("Incoherence of the Incoherence"), serves as a direct refutation of al-Ghazali's seminal philosophical critique, The Incoherence of the Philosophers (d. 1111). This text synthesizes concepts from Averroes's commentaries and independent treatises to formulate his response to al-Ghazali. Furthermore, it scrutinizes Avicenna's Neoplatonist inclinations, occasionally concurring with al-Ghazali's criticisms of Avicenna.
Medicine
Averroes, who held the position of royal physician within the Almohad court, authored numerous medical treatises. His most renowned work, al-Kulliyat fi al-Tibb ("The General Principles of Medicine"), subsequently Latinized in the West as the Colliget, was composed around 1162, predating his court appointment. This volume's title contrasts with al-Juz'iyyat fi al-Tibb ("The Specificities of Medicine"), penned by his colleague Ibn Zuhr, with whom Averroes collaborated to ensure their respective works were complementary. The Latin rendition of the Colliget achieved widespread adoption as a medical textbook across Europe for several centuries. Other extant titles by Averroes encompass On Treacle, The Differences in Temperament, and Medicinal Herbs. Additionally, he produced summaries of the writings of the Greek physician Galen (d. c. 210) and a commentary on Avicenna's Urjuzah fi al-Tibb ("Poem on Medicine").
Averroes contributed groundbreaking observations in medicine. He accurately identified the retina, not the lens, as the principal organ for light perception, a notable divergence from contemporary theories. Furthermore, Averroes furnished initial descriptions of conditions akin to Parkinson's disease and advanced understanding of stroke, positing its origins in cerebral factors rather than peripheral blockages.
Jurisprudence and Law
Averroes held several judicial appointments and authored numerous works concerning Islamic jurisprudence and legal theory. The sole extant text is Bidāyat al-Mujtahid wa Nihāyat al-Muqtaṣid ("Primer of the Discretionary Scholar"). Within this treatise, he elucidates the divergences of opinion (ikhtilaf) among the Sunni madhhabs (schools of Islamic jurisprudence), examining both their practical applications and their foundational juristic principles, and explaining the inherent reasons for these variations. Notwithstanding his position as a Maliki judge, the book also explores the perspectives of other schools, encompassing both liberal and conservative interpretations. Beyond this surviving work, bibliographical records indicate his authorship of a summary of Al-Ghazali's On Legal Theory of Muslim Jurisprudence (Al-Mustasfa) and treatises on sacrifices and land taxation.
Philosophical Ideas
Aristotelianism within the Islamic Philosophical Tradition
In his philosophical corpus, Averroes endeavored to re-establish a pure Aristotelianism, contending that it had been corrupted by the Neoplatonist inclinations of Muslim thinkers like Al-Farabi and Avicenna. He repudiated Al-Farabi's efforts to synthesize Platonic and Aristotelian concepts, highlighting their fundamental divergences, such as Aristotle's rejection of Plato's theory of Forms. Furthermore, he critiqued Al-Farabi's logical treatises for misrepresenting their Aristotelian origins. Averroes composed a comprehensive critique of Avicenna, a prominent proponent of Islamic Neoplatonism during the Middle Ages. He asserted that Avicenna's emanation theory contained numerous logical flaws and lacked any basis in Aristotle's writings. Averroes contested Avicenna's proposition that existence is merely an accidental attribute appended to essence, instead positing the inverse: that an entity exists per se, and its essence is discernible only through subsequent abstraction. He also dismissed Avicenna's theories of modality and his argument for the existence of God as the Necessary Existent.
Averroes strongly advocated for the integration of Greek philosophical thought into the Islamic intellectual tradition, asserting that "if someone before us has investigated [wisdom], it is incumbent upon us to draw assistance from their insights, irrespective of their communal affiliation."
The Interrelationship Between Religion and Philosophy
During Averroes's era, philosophical inquiry faced significant opposition from within the Sunni tradition, particularly from theological movements such as the Hanbali school and the Ashʾarites. Notably, the Ashʾari scholar al-Ghazali (1058–1111) authored The Incoherence of the Philosophers, a potent and widely influential critique targeting the Neoplatonic philosophical current within the Islamic world, with a specific focus on Avicenna's contributions. Al-Ghazali, among other accusations, charged philosophers with apostasy from Islam and endeavored to refute their doctrines through logical argumentation.
In his work Decisive Treatise, Averroes posits that philosophy—defined by him as conclusions derived through rational inquiry and rigorous methodology—cannot fundamentally conflict with Islamic revelations. He asserts that both represent distinct pathways to truth, and "truth cannot contradict truth." Should philosophical conclusions seemingly diverge from scriptural texts, Averroes contended that revelation necessitates interpretation or allegorical understanding to resolve the apparent inconsistency. This interpretive task, he argued, must be undertaken by individuals "rooted in knowledge"—a phrase from surah Āl Imrān 3:7 of the Quran, which Averroes applied to philosophers of his time who possessed access to the "highest methods of knowledge." Furthermore, he maintained that the Quran encourages Muslims to engage in philosophical study, as the contemplation and examination of nature would deepen one's comprehension of "the Artisan" (God). Citing various Quranic verses that urge reflection on the natural world, Averroes utilized these to issue a fatwa, declaring philosophy permissible for Muslims and potentially an obligation, particularly for those intellectually gifted in the discipline.
Averroes further delineated three distinct modes of discourse: the rhetorical, which relies on persuasion and is accessible to the general populace; the dialectical, founded on debate and frequently utilized by theologians and the ulama (religious scholars); and the demonstrative, which is predicated on logical deduction. He asserted that the Quran employs a rhetorical approach to convey truth, thereby effectively reaching the common masses through its persuasive power. In contrast, philosophy, according to Averroes, utilizes demonstrative methods, which, while restricted to the learned, offer the most profound understanding and knowledge.
Averroes also endeavored to counter Al-Ghazali's critiques of philosophy by contending that many of these criticisms were applicable solely to Avicenna's philosophical system, rather than to Aristotle's. Averroes posited that Aristotle's philosophy represented the authentic tradition, from which Avicenna had diverged.
The Nature of God
Divine Existence
Averroes articulates his perspectives on the existence and essence of God within his treatise, The Exposition of the Methods of Proof. In this work, he meticulously analyzes and critiques the theological tenets of four Islamic factions: the Asharites, the Mutazilites, the Sufis, and those he designates as "literalists" (al-hashwiyah). His examination includes a critical assessment of their respective proofs for God's existence. Averroes himself advances two arguments for divine existence, which he considers both logically robust and consonant with the Quran: the arguments from "providence" and "from invention." The argument from providence posits that the cosmos and the natural world exhibit a precise attunement conducive to sustaining human life. Averroes specifically referenced the sun, moon, rivers, seas, and humanity's terrestrial placement as evidence. He inferred from this intricate arrangement the presence of a creator who fashioned these elements for human well-being. The argument from invention, conversely, asserts that terrestrial phenomena, such as animals and plants, appear to be deliberately designed. Consequently, Averroes concluded that a divine designer, identified as God, orchestrated their creation. These two arguments by Averroes are fundamentally teleological, contrasting with the cosmological arguments favored by Aristotle and most contemporary Muslim Kalam theologians.
Divine Attributes
Averroes affirms the principle of divine oneness (tawhid) and postulates seven divine attributes for God: knowledge, life, power, will, hearing, vision, and speech. Particular emphasis is placed on the attribute of knowledge, with Averroes differentiating divine knowledge from human understanding by asserting that God comprehends the cosmos as its ultimate cause, whereas human perception is limited to its observable effects.
Averroes posits that the attribute of life is deducible, serving as a prerequisite for knowledge and evidenced by God's volitional act of bringing entities into existence. Divine power is similarly inferred from God's capacity to actualize creations. Furthermore, he contends that knowledge and power inherently culminate in speech. Concerning vision and speech, Averroes asserts that God's creation of the world implies an intrinsic and comprehensive understanding of its every component, akin to an artist's intimate grasp of their own creation. Given that the visual and auditory realms constitute fundamental aspects of the cosmos, God must consequently possess the attributes of vision and speech.
The omnipotence paradox was initially examined by Averroes, preceding its subsequent consideration by Thomas Aquinas.
The World's Pre-eternity
Centuries before Averroes, a significant intellectual discourse unfolded among Muslim scholars regarding the world's temporal origin, specifically whether it was created at a discrete point in time or possessed an eternal existence. Prominent Neo-Platonic philosophers, including Al-Farabi and Avicenna, asserted the world's perpetual existence. This perspective was challenged by the mutakallimin (philosophers and theologians) of the Ashʾari tradition; notably, al-Ghazali composed a comprehensive refutation of the pre-eternity doctrine in his The Incoherence of the Philosophers, and furthermore accused the Neoplatonists of unbelief (kufr).
Averroes subsequently addressed al-Ghazali's arguments in his work, Incoherence of the Incoherence. He initially contended that the doctrinal disparities between the two viewpoints were insufficient to justify an accusation of unbelief. Furthermore, Averroes asserted that the pre-eternity doctrine did not inherently conflict with the Quran, citing verses that allude to a pre-existing "throne" and "water" within creation narratives. Averroes maintained that a meticulous interpretation of the Quran suggested that only the universe's "form" was temporally created, while its underlying existence remained eternal. He additionally critiqued the mutakallimin for utilizing their scriptural interpretations to address questions that, in his view, properly belonged within the domain of philosophy.
Political Philosophy
Averroes articulates his political philosophy within his commentary on Plato's Republic. He synthesizes his concepts with Platonic thought and Islamic tradition, conceiving the ideal state as one founded upon Islamic law (shariah). His interpretation of Plato's philosopher-king aligns with Al-Farabi's, identifying this figure with the imam, caliph, and lawgiver of the polity. Averroes's delineation of the philosopher-king's attributes mirrors those presented by Al-Farabi, encompassing a profound love of knowledge, exceptional memory, a passion for learning, devotion to truth, aversion to sensual indulgences, disinterest in accumulating wealth, magnanimity, courage, steadfastness, eloquence, and the capacity to "light quickly on the middle term". Averroes posits that even when philosophers are unable to govern directly—a situation prevalent in the Almoravid and Almohad empires during his era—they retain the imperative to influence rulers toward the realization of the ideal state.
Averroes identifies two primary pedagogical approaches for instilling virtue in citizens: persuasion and coercion. Persuasion, encompassing rhetorical, dialectical, and demonstrative techniques, represents the more inherent method; nevertheless, coercion becomes indispensable for individuals unresponsive to persuasive efforts, such as state adversaries. Consequently, he legitimizes warfare as a final recourse, substantiating this position with Quranic arguments. He thus contends that effective state leadership and defense necessitate a ruler possessing both wisdom and courage.
Echoing Plato, Averroes advocates for women's equitable participation with men in state administration, encompassing roles as soldiers, philosophers, and rulers. He expressed regret regarding the restricted public roles for women in contemporary Muslim societies, asserting that such limitations detrimentally affected the state's overall welfare.
Averroes concurred with Plato's concept of state degeneration. He illustrated this by referencing the transformation of the Rashidun Caliphate, traditionally regarded in Sunni Islam as the exemplary state governed by "rightly guided caliphs," into a dynastic entity under Muawiyah, the founder of the Umayyad dynasty. Furthermore, he posited that the Almoravid and Almohad empires, initially established as ideal states founded on Sharia principles, subsequently devolved through stages of timocracy, oligarchy, democracy, and ultimately, tyranny.
Variations in Islamic Jurisprudence
Throughout his career as a judge and jurist, Averroes predominantly rendered judgments and issued fatwas in accordance with the Maliki school of Islamic law, which held sway in Al-Andalus and the western Islamic world during his era. Nevertheless, he often demonstrated independent judgment, occasionally dissenting from the "consensus of the people of Medina," a traditional tenet of the Maliki school. In Bidāyat al-Mujtahid, a significant work in Islamic jurisprudence, he not only delineated the distinctions among various schools of Islamic law but also endeavored to provide a theoretical framework for understanding the origins and inevitability of these divergences. Despite all Islamic legal schools deriving their foundational principles from the Quran and Hadith, Averroes identified "causes that necessitate differences" (al-asbab al-lati awjabat al-ikhtilaf). These causes encompass variations in interpreting scripture broadly or specifically, in construing scriptural commands as either obligatory or merely recommended, or prohibitions as either discouragement or absolute prohibition, alongside ambiguities inherent in linguistic terms or phrases. Averroes further noted that the application of qiyas (reasoning by analogy) could lead to diverse legal opinions, as jurists might dispute the relevance of particular analogies or encounter conflicting analogical inferences.
Natural Philosophy
Astronomy
Following Avempace and Ibn Tufail, Averroes critically assessed the Ptolemaic system, employing philosophical arguments to reject the use of eccentrics and epicycles in explaining the apparent motions of the Moon, Sun, and planets. He contended that these celestial bodies exhibit uniform, strictly circular motion around the Earth, consistent with Aristotelian principles. Averroes posited three categories of planetary motion: those discernible to the naked eye, those necessitating instrumental observation, and those ascertainable solely through philosophical reasoning. Averroes theorized that the Moon's intermittent opaque coloration resulted from variations in its thickness, with denser regions absorbing and consequently reflecting more sunlight than thinner areas. This hypothesis persisted among European Scholastics until the seventeenth century to explain Galileo's observations of lunar spots, with figures like Antoine Goudin eventually conceding in 1668 that these phenomena were more plausibly attributable to lunar mountains. Both Averroes and Ibn Bajja observed sunspots, which they interpreted as transits of Venus and Mercury across the Sun's disk relative to Earth. In 1153, he undertook astronomical observations in Marrakesh, noting the star Canopus (Arabic: Suhayl), which was not visible from the latitude of his native Spain. This observation served to corroborate Aristotle's argument for a spherical Earth.
Averroes recognized that contemporary Arabic and Andalusian astronomers primarily engaged in "mathematical" astronomy, which, while facilitating accurate computational predictions, lacked a comprehensive physical explanation for the universe's operation. He famously stated that "the astronomy of our time offers no truth, but only agrees with the calculations and not with what exists." Consequently, he endeavored to reform astronomy, aiming to align it with physics, particularly Aristotelian physics. His extensive commentary on Aristotle's Metaphysics outlines the foundational principles of his proposed reform; however, he later acknowledged the failure of these efforts. He admitted to lacking sufficient time or expertise to reconcile observed planetary motions with Aristotelian principles. Furthermore, his unfamiliarity with the works of Eudoxus and Callippus meant he overlooked crucial contextual elements within some of Aristotle's astronomical writings. Nevertheless, his contributions significantly influenced the astronomer Nur ad-Din al-Bitruji (d. 1204), who adopted many of Averroes' reform principles and successfully proposed an early astronomical system grounded in Aristotelian physics.
Physics
Averroes diverged from the inductive methodology, then being advanced by Al-Biruni in the Islamic world and more aligned with contemporary physics. Instead, as characterized by science historian Ruth Glasner, Averroes functioned as an "exegetical" scientist, generating novel theories concerning nature through critical engagement with prior texts, particularly those by Aristotle. While this approach often led to his portrayal as an unoriginal adherent of Aristotle, Glasner contends that Averroes's contributions to physics were remarkably innovative, notably his detailed expositions on Aristotle's minima naturalia and on motion conceptualized as forma fluens. These concepts subsequently gained traction in the Western intellectual tradition and significantly influenced the broader evolution of physics.
Psychology
Averroes articulated his psychological theories across three commentaries on Aristotle's On the Soul. His primary objective was to elucidate the human intellect through philosophical inquiry and the interpretation of Aristotelian concepts. Averroes's stance on this subject evolved considerably over his career. In his initial work, the short commentary, he adopted Ibn Bajja's hypothesis that a "material intellect" retains specific sensory images experienced by an individual. These images then form the foundation for "unification" by a universal "agent intellect," a process that, upon completion, confers universal knowledge of the concept upon the individual. Subsequently, in his middle commentary, Averroes shifted towards the perspectives of Al-Farabi and Avicenna, positing that the agent intellect bestows upon humans the capacity for universal understanding, which he identified as the material intellect. This capacity is activated, granting universal knowledge, once an individual accumulates sufficient empirical interactions with a particular concept.
In his final work, the Long Commentary, Averroes advanced an alternative theory, subsequently termed "the unity of the intellect." Within this framework, he contended that a singular material intellect exists, shared by all humanity and entirely distinct from the individual human body. To account for the diversity of individual thoughts, Averroes introduced the concept of fikr—rendered as cogitatio in Latin—a cerebral process that involves the "active consideration of particular things" encountered by an individual, rather than universal knowledge. This theory provoked significant debate upon the introduction of Averroes's writings into Christian Europe, notably prompting Thomas Aquinas to compose a comprehensive critique in 1229, titled On the Unity of the Intellect against the Averroists.
Medicine
Although Averroes's medical writings demonstrate profound theoretical knowledge of contemporary medicine, his practical experience as a physician was likely restricted. He himself stated in one text that he had "not practiced much apart from myself, my relatives or my friends." While he held the position of a royal physician, his qualifications and training were predominantly theoretical. His medical treatise, Al-Kulliyat fi al-Tibb, largely adhered to the Galenic medical doctrine, established by the influential second-century Greek physician and author Galen. This doctrine posited that the balance of the four humors—blood, yellow bile, black bile, and phlegm—was essential for human health. Among Averroes's original contributions are his insights into the retina; he may have been the first to identify the retina, rather than the lens, as the ocular component responsible for light perception. While contemporary scholars debate the precise interpretation of his statements in his Kulliyat, Averroes articulated a comparable observation in his commentary on Aristotle's Sense and Sensibilia: "the innermost of the coats of the eye [the retina] must necessarily receive the light from the humors of the eye [the lens], just like the humors receive the light from air."
A further divergence from Galenic and contemporary medical theories is Averroes's characterization of stroke as originating in the brain and resulting from an arterial obstruction between the heart and the brain. This explanation aligns more closely with the current medical understanding of the condition than Galen's theory, which attributed it to an obstruction between the heart and the body's periphery. Furthermore, Averroes provided the initial description of the signs and symptoms of Parkinson's disease in his Kulliyat, though he did not assign a specific name to the ailment.
Legacy
In Jewish Tradition
Maimonides (d. 1204) stands out among the initial Jewish scholars who embraced Averroes's writings with considerable enthusiasm, remarking that he had "received lately everything Averroes had written on the works of Aristotle" and affirming Averroes "was extremely right." During the thirteenth century, several Jewish authors, such as Samuel ibn Tibbon in his treatise Opinion of the Philosophers, Judah ben Solomon ha-Kohen in his volume Search for Wisdom, and Shem-Tov ibn Falaquera, extensively utilized Averroes's texts. Joseph Ibn Kaspi completed the first comprehensive Jewish translation of Averroes's commentaries on Aristotle's Organon in 1232. Subsequently, in 1260, Moses ibn Tibbon released translations encompassing nearly all of Averroes's commentaries and a selection of his medical treatises. Jewish Averroism reached its zenith in the fourteenth century, with influential Jewish figures like Kalonymus ben Kalonymus of Arles, France, Todros Todrosi of Arles, Elia del Medigo of Candia, and Gersonides of Languedoc either translating or being significantly shaped by Averroes's intellectual contributions.
Falaquera, Yehuda Moscato, and Abraham Bibago invoked Averroes's authority to assert that the Greeks derived their scientific and philosophical insights from Jewish traditions.
Within the Latin Scholastic Tradition
Averroes exerted his primary influence on the Christian West through his comprehensive commentaries on Aristotle. Following the collapse of the Western Roman Empire, Western Europe experienced a period of cultural regression, leading to the near-total disappearance of the intellectual heritage of Classical Greek scholars, including Aristotle's works. Averroes's commentaries, translated into Latin and introduced to Western Europe during the thirteenth century, offered authoritative interpretations of Aristotle's philosophical contributions, thereby restoring access to this lost knowledge. The profound impact of these commentaries resulted in Averroes being commonly designated as "The Commentator" in Latin Christian texts, rather than by his proper name. He has also been characterized as the "father of free thought and unbelief" and the "father of rationalism."
Michael Scot (1175 – c. 1232) initiated the Latin translation of Averroes's corpus, undertaking the rendition of the extensive commentaries on Physics, Metaphysics, On the Soul, and On the Heavens, alongside numerous intermediate and concise commentaries, commencing in 1217 in Paris and Toledo. Subsequently, other European scholars, including Hermannus Alemannus, William de Luna, and Armengaud of Montpellier, translated additional works by Averroes, occasionally with assistance from Jewish collaborators. Shortly thereafter, Averroes's writings disseminated widely among Christian scholars within the scholastic tradition. His intellectual output fostered a dedicated group of adherents, who became known as the Latin Averroists. Paris and Padua emerged as significant hubs for Latin Averroism, with notable thirteenth-century proponents such as Siger of Brabant and Boethius of Dacia.
The Roman Catholic Church's authorities responded with opposition to the proliferation of Averroism. In 1270, Étienne Tempier, the Bishop of Paris, promulgated a condemnation of 15 doctrines—many of which were rooted in Aristotelian or Averroist thought—asserting their incompatibility with ecclesiastical tenets. Seven years later, in 1277, at the behest of Pope John XXI, Tempier issued a further condemnation, this one encompassing 219 theses derived from various intellectual currents, predominantly the teachings of Aristotle and Averroes.
Averroes encountered a varied reception among other Catholic intellectuals. Thomas Aquinas, a preeminent Catholic philosopher of the thirteenth century, extensively utilized Averroes's interpretations of Aristotle while simultaneously articulating significant disagreements. For instance, Aquinas composed a comprehensive critique of Averroes's theory positing a singular, shared intellect for all humanity. He also challenged Averroes's positions regarding the eternity of the universe and the concept of divine providence. Ramon Llull, another notable figure, actively opposed Averroism, drawing a clear distinction between Islam, which he deemed tolerable as a religion, and Averroism, particularly its Latin manifestation, which he argued should be resisted as a philosophy.
The condemnations issued by the Catholic Church in 1270 and 1277, coupled with Aquinas's meticulous critique, collectively attenuated the dissemination of Averroism within Latin Christendom. Nevertheless, the movement retained adherents until the sixteenth century, a period marking the gradual divergence of European intellectual currents from Aristotelian philosophy. Prominent Averroists in subsequent centuries included John of Jandun and Marsilius of Padua (fourteenth century), Gaetano da Thiene and Pietro Pomponazzi (fifteenth century), and Agostino Nifo and Marcantonio Zimara (sixteenth century).
Within the Islamic Intellectual Tradition
Averroes exerted minimal significant influence on Islamic philosophical discourse until the modern era. This limited impact was partly attributable to geographical factors; Averroes resided in Spain, situated at the western periphery of Islamic civilization, distant from established centers of Islamic intellectual heritage. Furthermore, his philosophical tenets might not have resonated with contemporary Islamic scholars. His emphasis on Aristotelian texts was considered anachronistic within the twelfth-century Muslim world, which had extensively analyzed Aristotle since the ninth century and was by then deeply immersed in emerging intellectual currents, particularly those associated with Avicenna. During the nineteenth century, Muslim intellectuals recommenced their engagement with Averroes's oeuvre. This period coincided with a cultural resurgence, known as Al-Nahda (meaning "reawakening"), across the Arabic-speaking regions, where Averroes's writings were perceived as a catalyst for modernizing Islamic intellectual traditions.
Cultural Depictions
Averroes is referenced in various cultural contexts within both Western and Muslim societies. Dante Alighieri's epic poem, The Divine Comedy, finalized in 1320, portrays Averroes, identified as "who made the Great Commentary," alongside other non-Christian Greek and Muslim intellectuals, situated in the first circle of hell near Saladin. Geoffrey Chaucer's 1387 prologue to The Canterbury Tales includes Averroes among the prominent medical authorities recognized in Europe during that era. Raphael's 1501 fresco, The School of Athens, adorning the Apostolic Palace in the Vatican, features Averroes among other foundational philosophical figures. Within this painting, Averroes is depicted in a green robe and turban, observing from behind Pythagoras, who is shown engaged in writing.
Victor Hugo's novel, The Hunchback of Notre-Dame (composed in 1831 and set in 1482 Paris), contains a brief mention of Averroes. The antagonist, Priest Claude Frollo, praises Averroes's alchemical prowess during his relentless pursuit of the Philosopher's Stone.
Jorge Luis Borges's 1947 short story, "Averroes's Search" (Spanish: La Busca de Averroes), explores his endeavors to comprehend Aristotle's Poetics within a cultural context devoid of live theatrical traditions. In the story's afterword, Borges reflects, "I felt that [the story] mocked me, foiled me, thwarted me. I felt that Averroës, trying to imagine what a play is without ever having suspected what a theater is, was no more absurd than I, trying to imagine Averroës yet with no more material than a few snatches from Renan, Lane, and Asín Palacios." Averroes also serves as the central figure in Youssef Chahine's 1997 Egyptian film Destiny, produced partly to commemorate the 800th anniversary of his passing. The plant genus Averrhoa (encompassing species such as starfruit and bilimbi), the lunar crater Ibn Rushd, and the asteroid 8318 Averroes are all posthumously named in his honor.
Mael Malihabadi's 1957 Urdu historical fiction novel, Falsafi ibn-e Rushd, centers on Averroes's life.
Scholarly Notes
Bibliographical Citations
Bibliography
Works of Averroes
Works of Averroes
- DARE, the Digital Averroes Research Environment, represents a continuing initiative to compile digital images of all Averroes manuscripts and complete texts across all three linguistic traditions.
- Averroes, Islamic Philosophy Online.
- The Philosophy and Theology of Averroes: Tractata translated from the Arabic, translated by Mohammad Jamil-ur-Rehman, 1921.
- The Incoherence of the Incoherence, translated by Simon van den Bergh. [N.B. : As these refutations primarily comprise commentary on verbatim quotations from al-Ghazali, this work includes a translation of the majority of the Tahafut.] An Italian translation by Massimo Campanini, Averroè, L'incoerenza dell'incoerenza dei filosofi, was published in Turin by Utet in 1997.
- [1] SIEPM virtual library, which contains scanned copies (PDF) of the Editio Juntina of Averroes's Latin works (Venice 1550–1562).
- Ibn Rushd (2017). Bidayat al-Mujtahid wa Nihayat al-Muqtasid. Dar Al Kotob Al Ilmiyah. ISBN 978-2745134127.Further Resources
- Fouad Ben Ahmed & Robert Pasnau. "Ibn Rushd [Averroes]". In Zalta, Edward N. (ed.). Stanford Encyclopedia of Philosophy. ISSN 1095-5054. OCLC 429049174.H. C. Hillier. "Ibn Rushd (Averroes)".Source: TORIma Academy Archive