Aristotle’s Eudemus aims to present a dramatically new view of the content of Aristotle’s lost Eudemus. Rather than being representative of a supposed early/Platonic phase of Aristotle’s development, Van Buren-Penev shows that this dialogue developed the core of Aristotle’s psychology and theology, establishing basic positions upon which Aristotle relies over the entirety of his philosophical output. This book thoroughly reassesses reports standardly included in collections of Aristotle’s lost corpus and collects many new fragments. Of crucial importance is a very much overlooked period of the reception of Aristotle’s dialogues, namely that of the early Fathers of the Church, who prove to be central in reconstructing the content of Aristotle’s lost Eudemus.