John Philoponus (John the Grammarian, John of Alexandria, Johannes Grammaticus, Johannes Alexandrinus), c. 490 - c. 570. Late classical Alexandrian Christian philosopher, best known for his critical attacks on Aristotle's physics. Although his writings are independent of any dogmatic tradition, his cloases affiliation is with Alexandrian Neoplatonism.
John Philoponus
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An extensive discussion of his philosophical and theological works, as well as his personal history. By Christian Wildberg, from the Stanford Encyclopedia of Philosophy.