 Although there are no extant commentaries on Plato that are known to come from Simplicius’ hand, Simplicius’ readers will notice his intimate familiarity with and highest esteem for Plato. Simplicius’ commentaries constitute a rich source for Platonic philosophy, and he is well known for his tendency to harmonise Plato and Aristotle (see  §6).  His work continues a tendency, probably initiated by Porphyry, to make Plato’s pupil an integral part of the Platonic tradition, reading Aristotle through Platonic—or rather Neoplatonic—lenses. Simplicius frequently chooses a Platonic dialogue in order to compare Plato’s and Aristotle’s philosophy in a specific domain by way of contrast—for example, when he comments on the Physics and the De Caelo, where the Timaeus is always at hand. The Sophist and his the doctrine of the highest kinds (megista genê) play an important role in Simplicius’ commentary on the Categories (cf. already in Plotinus VI 1–3 [42–44]). It should also be noted that Iamblichus’ Neoplatonic psychology, which can be considered a systematisation of Plato’s views, lies in the background throughout the Commentary on the De anima. When Simplicius finds references to Eleatic philosophy in Aristotle (especially in Physics I), the Sophist and Parmenides also figure prominently.