 Simplicius wrote four commentaries that survive today (on Epictetus’ Handbook and Aristotle’s Categories, Physics, and De Caelo). It is debatable whether, as univocally attested by the all manuscripts, Simplicius is also the author of a fifth commentary, on Aristotle’s De anima. Although there are several other works that he might have written, these do not include any commentaries on Plato aside from one work on the Phaedo (Goulet &amp; Coda 2016: 361–364, 390–394; see In Cael. 369.4–6 and In Epict. I, 350–354 [Hadot]). As is discussed in the supplement  The Commentaries of Simplicius, it is  difficult to determine the order and periods in which Simplicius  composed his commentaries.