 A common practice among later Neoplatonists was to preface their commentaries with a series of questions or preliminary points (kephalaia) that should be settled before embarking on the exegesis proper (Hadot &amp; Hoffmann 1990: 21–160; Hoffmann 1998; Mansfeld 1994; for an excellent (English) summary see Hoffmann 2006: 607–613). The form that these prolegomena, as they were called, take in Simplicius was introduced by the Neoplatonist Proclus (Elias/David, In Cat. 107.24–26). In the case of Aristotle’s Categories, for instance, we find not only prolegomena suited for this very text (in seven points), but also a general introduction to Aristotle’s philosophy (in ten points; for a useful overview see Hoffmann 2006: 607–613). This is because the Categories was the first of Aristotle’s texts to be read in the Neoplatonic school: