Plotinus
After Plato and Aristotle, Plotinus (b. 204/5–d. 270 ce) stands out as the most accomplished and influential philosopher of Antiquity. He is also the only philosopher from this period, other than Plato, whose works are all extant. In his writings, collectively known by the name given to them by his student and editor, Porphyry, as Enneads (“nines” in Greek, for the six groups of nine “treatises”), he engages with the entire history of philosophy up to that time, systematizing Plato and defending that system against all comers, especially Peripatetics, Skeptics, and Stoics. For the next three hundred or so years, philosophy in Late Antiquity took Plotinus as its starting point. Proclus (b. 412–d. 485 ce) thought of him as the principal “exegete of the Platonic revelation.” Philosophy in Late Antiquity was essentially Platonism as constructed by Plotinus, and it is this philosophy that Christians, Muslims, and Jews appropriated and struggled to fit within their theological frameworks.