1926. This edition contains both Volume I and II of this work. Plotinus is considered to be the founder of Neo-Platonism. Taking his lead from his reading of Plato, Plotinus developed a complex spiritual cosmology involving three hypostases: the One, the Intelligence, and the Soul. The philosophy of Plotinus is represented in the complete collection of his treatises, collected and edited by his student Porphyry into six books of nine treatises each. For this reason they have come down to us under the title of the Enneads. Other volumes in this set are ISBN(s): 0766192423.