Abstract
This new study, an updated version of the author's doctoral dissertation, is a detailed investigation of Porphyry's one extant commentary on Aristotle's Categories and Plotinus' critique of Aristotle's doctrine of categories in "On the Kinds of Being". Evangeliou's investigation is limited by the fact that Porphyry's work was written for the student in an elementary "question and answer" format, yet Evangeliou is still able to decipher his general approach to Aristotle, which is respectful and conciliatory. In stark contrast is Plotinus' work, which makes little attempt to interpret Aristotle in a generous manner and rejects most of his doctrine of categories.