Was this Neoplatonist the greatest commentator on Aristotle who ever lived?

Ideas & Philosophy · Published 3 October 2026 · Updated 25 October 2026 Swipe more like this →

In short: Ammonius Hermiae, a brilliant Alexandrian philosopher, shaped centuries of thought by bridging the gap between Plato and Aristotle. Despite facing intense religious persecution in the late Roman Empire, he became a legendary teacher whose influence persisted through his students long after he was forced to compromise his public lectures.

Born around 440 in Alexandria, Ammonius was the son of philosophers Hermias and Aedesia. After studying under the renowned Proclus in Athens, he returned to his home city to lead the Neoplatonist school. His academic career was defined by a rigorous focus on logic and the sciences, earning him a public chair in the 470s. He became a central figure in the intellectual life of late antiquity, lecturing on astronomy, geometry, and the works of Plato, Aristotle, and Porphyry.

His life was marked by the volatile religious climate of the late Roman Empire. During the persecution of pagans in the late 480s, Ammonius reached a compromise with the Patriarch of Alexandria, Peter III. By voluntarily limiting his teaching, he managed to retain his position, a decision that drew sharp criticism from colleagues like Damascius. Yet, even his detractors acknowledged his immense stature, with Damascius famously labeling him the greatest commentator to ever live.

Ammonius’s direct written legacy is surprisingly small; only his commentary on Aristotle’s De Interpretatione survives intact. However, his influence was transmitted through the extensive lecture notes of his pupils, including John Philoponus, Simplicius, and Asclepius. These students preserved his insights on works ranging from the Categories to the Metaphysics. His philosophical reach was profound, with his arguments on divine foreknowledge and the effectiveness of prayer echoing the work of contemporaries like Boethius. Today, his name is remembered not only in the halls of philosophy but also on the moon, where a crater was named in his honor in 1976.

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