 Archytas  appears to have been the most popular name in which to forge treatises. Some 45 pages are devoted to pseudo-Archytan treatises in Thesleff’s collection as compared to 30 pages for Pythagoras. The most famous of the pseudo-Archytan texts is The Whole System of Categories, which, along with On Opposites, represents the attempt to claim Aristotle’s system of categories for the Pythagoreans. The pseudo-Archytan works on categories are very frequently cited by the commentators on Aristotle’s Categories (e.g., Simplicius and Syrianus) and were regarded as authentic by them, but in fact include modifications made to Aristotle’s theory in the first century BCE and probably were composed in that century (Szlezak 1972). Another treatise, On Principles, is full of Aristotelian terminology such as “form,” “substance,” and “what underlies”; On Intelligence and Perception contains a paraphrase of the divided line passage in Plato’s Republic. There are also a series of pseudepigrapha on ethics by Archytas and other authors (Centrone 1990). Philolaus, the third most famous Pythagorean after Pythagoras and Archytas, also turns up as the author of several spurious treatises, but a number of the forgeries were in the names of obscure or otherwise unknown Pythagoreans. Thus, Callikratidas and Metopos are presented as anticipating Plato’s doctrine of the tripartite soul and as using Plato’s exact language to articulate it (Thesleff 1965, 103.5 and 118.1–4). Although there are indications that some ancient scholars had doubts about the authenticity of the pseudo-Pythagorean texts, for the most part they succeeded in their purpose all too well and were accepted as genuine texts on which Plato and Aristotle drew.