In this paper the author will assess Plato’s tripartite psychology in the light of his metaphysical account of μέγιστα γένη and One and Many, in order to further clarify the structure of his “dualism”. By doing so, the author will try to show that the tripartition is not a metaphysical conundrum of Plato’s thought and that it cannot be read in the light of Cartesian substance dualism, which is a noticeable approach in contemporary discussions. Aside of that, Plato and Descartes (...) are often understood as the main advocates of the substance dualism. Since the author finds the approach misleading, the aim of the paper is to point out the fundamental differences between the two, foremost by paying attention to the role of body in conceptual determination of soul. (shrink)