The Life and Times of John Philoponus

Philoponus, like Simplikius himself, had studied at the feet of Ammonius. In Against Proclus he says that although Plato happens to have been right on this point, it is the truth that matters and not Plato's authority. He then provocatively lists a whole series of claims found in Plato that are just plain wrong. For some of these, Philoponus draws on his expertise in another field, medicine.