Un platonisme original au XIIe siècle : métaphysique pluraliste et théologie trinitaire dans le De unitate d'Achard de Saint-Victor

Abstract : The main goal of this dissertation is to describe how Achard of Saint-Victor uses Medio and Neoplatonic doctrines in his treatise De unitate et pluralitate creaturarum in order to answer the question about unity and plurality of God and his creatures. This will lead to a better comprehension of the role of platonic metaphysics in the doctrine of the school of St. Victor despite the weak presence of Plato’s heritage in the XIIth century. In the first part of the thesis, I introduce Achard’s philosophy and the paleographical and philological problems posed by the only manuscript of the De unitate. Then I consider the elements of the treatise (questions, doctrines, notions) which were borrowed from Middle Platonism and Neoplatonism. The two other parts are dedicated to the examination of the possibility of a plurality in God (persons and reasons in the Word of God) and in the world (as it is conceived by God through form-prototypes). In each part, I examine the way that main thinkers of Late Antiquity and High Middle Ages (Apuleius, Augustin, Chalcidius, Boethius, Erigena) and the Victorins (Hugues and Richard) absorbed the platonic doctrines described in the first part of my dissertation. At the end of each part, I propose the reconstruction of Achard’s development of those doctrines.This dissertation contributes to two problems of the history of philosophy: what Platonic doctrines and sources were received in the XIIth century and what is the place of the Platonic heritage in Victorin thought. The philosophical problems of the multiplication of intelligible and sensible objects, of the definition of things and of the identity of beings are also addressed.
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Iryna Lystopad. Un platonisme original au XIIe siècle : métaphysique pluraliste et théologie trinitaire dans le De unitate d'Achard de Saint-Victor. Philosophie. École pratique des hautes études - EPHE PARIS, 2016. Français. ⟨NNT : 2016EPHE5105⟩. ⟨tel-02105231⟩

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