Predicazione e ontologia nel primo Neoplatonismo (Porfirio e Giamblico)

The article focuses on debates concerning ontology and predication in early Neoplatonism (Porphyry and Iamblichus). Evidence coming from Simplicius’ Commentary on the Categories and from the Categories Commentary in the Archimedes Palimpsest suggests that Porphyry and Iamblichus interpreted Aristotle’s theory of synonymous predication (dici de subiecto) and specific differentia within the framework of their ontology (doctrine of the hierarchy of being). While Porphyry possibly suggested that a slightly emended version of Aristotle’s predication could express the relation between ante rem and in re items (akatatakton, katatetagmenon), Iamblichus argued that different metaphysical levels cannot in any way be conceived of as species ranked under the same genus (hence Iamblichus’ emphasis on paronymous predication). Further evidence coming from Iamblichus’ Reply to Porphyry and from the Anonymous Commentary on Plato’s Parmenides attributed to Porphyry confirms these conclusions.