Ennead, Volume I: Porphyry on the Life of Plotinus. Ennead IPlotinus (204 5270 CE) was the first and greatest of Neoplatonic philosophers. His writings were edited by his disciple Porphyry, who published them many years after his master's death in six sets of nine treatises each (the Enneads). Plotinus regarded Plato as his master, and his own philosophy is a profoundly original development of the Platonism of the first two centuries of the Christian era and the closely related thought of the Neopythagoreans,