 Porphyry was the first Platonist to write proper commentaries on Aristotle’s logical works and indeed on Aristotle generally (Karamanolis 2004) and from what can be gathered from what is extant he does so without assuming a strong Platonist point of view. There is an extant commentary of his on Aristotle’s Categories and another longer one in seven books, Ad Gedalium. This latter work was for centuries known only in mere short fragments from later commentators but a plausible case has been made that a recently discovered palimpsest contains a substantial portion of it (Chiaradonna et al. 2013). He also wrote commentaries on other parts of Aristotle´s Organon. He wrote the Isagoge, which is an introduction to Aristotle’s logical works in general. Through these logical writings Porphyry established himself as an important figure in the history of logic. He is the instigator of the tradition followed by subsequent Neoplatonists of taking Aristotle’s Categories as a basic introductory text and his Isagoge in particular served as a standard introductory text in Byzantium, the Arabic world and in the Latin West through Boethius’ translations and commentary. These texts served as a basic introductory texts in philosophy for at least 1000 years.