 Although the pseudepigrapha are too varied to admit of one origin, Centrone has recently argued that a core group of pseudepigrapha do appear to be part of a single project (2014a). They are written in Doric Greek (the dialect used in southern Italy where the Pythagoreans flourished) in order to give them the appearance of authenticity and share a common style. There are some twenty-five treatises belonging to this group and they include some of the most famous pseudepigrapha, including the work by ps.-Timaeus that was supposed to be Plato’s model, ps.-Archytas’ works on categories and ps.-Ocellus On the Universe. These treatises espouse the same basic system and seem designed to cover all the basic fields of knowledge. The system is based on theory of principles in which God is the supreme entity above a pair of principles, one of which is limited and the other unlimited, and which are identified with Aristotelian form and matter. This system is very similar to what is found in Eudorus, a Platonist working in Alexandria in the fist cenutury BCE. Starting from these principles a common system is then developed which applies to theology, cosmology, ethics, and politics. The connections to Eudorus and to Philo who also worked in Alexandria, very much suggest that this group of treatises was developed as a coherent project in Alexandria sometime in the first century BCE or the first century CE.