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In the process that followed the evolution of ancient Greek thought from mythology to a systematic philosophy, Parmenides, the founder of the Elea school, built up his thoughts with theses that were the exact opposite of his time and perhaps common sense in general. His famous poem On Nature, in the light of the logical principles, inferences, and analyses it contains, has profoundly influenced both epistemologies in terms of structure and possibility, and ontologies within the framework of time, space, and movement. In the mentioned period, the logical internal consistency of Parmenides and his followers, and the rational level in their arguments shaped the ancient period. The role he played especially in natural philosophy and metaphysics is undeniable. However, the ambiguities in the context of the theses and their interpretations of his poem, the only work that has been quoted, have not been resolved until today. The dimensions of this mystery are not only related to classical thought. Ontologies related to physics approaches, theoretical and institutional beliefs about them, and various cosmogony and language understandings can be related to Parmenides in some way. It is also possible to find in Parmenides's early forms some of the contents that form the basis of the philosophy of logic and has metaphysical roots constructed by Aristotle in the ancient period and for which he gained a well-deserved reputation. In addition to the deductive approach, especially the law of contradiction, the principle of identity, the law of excluded third, and the principles of sufficient reason are the most important concepts among those mentioned. These principles, which are not directly formulated, have been used in the context of Parmenides’ arguments about knowledge, existence, and related concepts. In our study, by touching on the significant points of the poem written by Parmenides, we will try to examine the conceptual uses and logical structures of the principles we have expressed and follow the traces of the process in question, and examine its effects. The main reason for this effort is that the content presented by Parmenides continues to be discussed today, maintained its influence in many areas mentioned above, and is an important cornerstone in the development of philosophy.