The aim of this article is to show that the trinitarian theology of Origen of Alexandria shares the same theoretical structure as the henology of Plotinus. In particular, there is a strong correspondence between the trinitarian hypostases in Origen and the moments of the One in Plotinus: the Father is the One; the Son-Logos is the Intelligence; finally, the Holy Spirit is the Soul. Both Origen and Plotinus seem to assume the ontological difference between God, who, on the one hand, (...) comes before the generation of the Son, i.e., before the distinction between Father and Son, and who is indeed God, and, on the other hand, God who is the Father as he generates the Son and who, by doing so, distinguishes himself from himself. The system of ideas which represents the basis of both the theology of Origen and the henology of Plotinus is evidently a Platonic one. (shrink)