Polo‘s philosophy is deeply rooted in Aquinas‘ distinction between being and essence. The author applies a circular hermeneutic. Aquinas philosophy of the person is read from the perspective of Polo's account in order to elucidate Polo‘s own Trascendental Anthropology. The expo-sition is structured in two parts, each one describing a fundamental the-sis. The first concerns the notion of person in Thomas, which appears in his discussion of Boethius‘ definition. The second one deals with the problem of conciliating mind as form of the body and as a spiritual substance.