Why the most celebrated commentator on Aristotle was known simply as The Commentator

Ideas & Philosophy · Published 29 September 2026 Swipe more like this →

In short: Living in Athens at the dawn of the 3rd century, Alexander of Aphrodisias became the definitive interpreter of Aristotle. His influence was so profound that later scholars referred to him by a singular title. Yet, his own original philosophy—challenging Stoic determinism and the immortality of the soul—sparked centuries of debate.

Alexander of Aphrodisias, a Peripatetic philosopher active around 200 AD, earned the title 'the commentator' for his unparalleled work on Aristotle. As head of the Peripatetic school in Athens, he sought to strip away syncretistic interpretations to recover Aristotle's pure doctrine. His commentaries, ranging from the Prior Analytics to Metaphysics, became essential reading for generations of thinkers, including those in the Arab world, where his works were widely translated and cited by Maimonides.

Beyond his role as an interpreter, Alexander was a formidable original thinker. In his treatise On Fate, he rejected the Stoic doctrine of necessity and determinism, defending a position that mirrors modern libertarian views on moral responsibility. His work On the Soul was equally provocative; he argued that human reason is inseparable from the body and explicitly denied the soul's immortality. This stance later fueled the Renaissance 'Alexandrist' school, led by figures like Pietro Pomponazzi, who championed these views against competing theological doctrines.

Alexander's legacy is complex, marked by both his philosophical rigor and the historical uncertainty surrounding his corpus. Some works attributed to him, such as the commentary on the Sophistical Refutations or the Medical Questions, are considered spurious, potentially misattributed to his father, also a philosopher. Despite this, his influence persisted through the centuries, even triggering a formal condemnation by the Church Council of Paris in 1210. Today, he remains a pivotal figure in the history of philosophy, his name even attached to the 'Alexander's band' optical phenomenon seen in rainbows.

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