Epistemological Analyzes of Ontology in Plato and Descartes

In certain respects, Plato and Descartes, one of which is considered as the pioneer of classical and the other of modern philosophy, differ from each other not only in terms of their ages; differ in their understanding of soul, body and substance. However, it can be claimed that they have very close understan-dings in terms of the modus operandi (working style, method) on which they base their search for the truth. While Plato laid the groundwork for the ope-ning of psyche to Being, Descartes put epistemology in the center while he was basing his understanding of self-God-extended bodies. In this context, it may be possible to say that philosophers can be compared in terms of giving diffe-rent degrees of epistemological character to existence. In this respect, this study deals with the different and similar relationships and epistemological analyzes that Plato and Descartes, who created important changes in the his-tory of Western Philosophy, established between ontology and epistemology.