 In his lectures on Aristotle, Ammonius was heavily indebted to his teacher Proclus, even if he disagreed with him on some important points. The introduction to his in Int. makes Ammonius’ great debt to Proclus clear: “Now, we have recorded the interpretations of our divine teacher Proclus, successor to the chair of Plato and a man who attained the limits of human capacity both in the ability to interpret the opinions of the ancients and in the scientific judgment of the nature of reality. If, having done that, we too are able to add anything to the clarification of the book, we owe great thanks to the god of eloquence” (1,6–11; cf. in An. Pr. 43,30, with a citation of Proclus’ School Commentary [skholikon hupomnēma]). Proclus, in turn, often used Iamblichus (see, e.g., in An. Pr. 40,16). In addition, Ammonius used other commentators. For example in his in Int., most of his material comes from Proclus’ lectures, but Ammonius has polished up what he had in his notes of those lectures, then added material of his own or from other sources. In this case, Ammonius’ main source for supplementing Proclus’ lectures was apparently the now lost voluminous commentary (see Stephanus in Int. 63,9) of Porphyry, which was also the major source of Boethius’ commentary on De Int. and probably also of Ammonius’ citations of earlier authors, such as Alexander of Aphrodisias (active late 2nd to early 3rd century), Aspasius (first half of 2nd century), Herminus’ (2nd C.), and the Stoics. Both Porphyry and Proclus held Int. c. 14 to be spurious (252,10 ff.). Although Ammonius agreed, unlike them he decided to include commentary on the chapter, which he repeats ‘verbatim’ from Syrianus, having nothing of his own to add (254,22–31; cf. 253,12).