Plotinus (204/5–270 C.E.) is a central figure in the history of Western philosophy. However, during the Middle Ages he was almost unknown. None of the treatises constituting his Enneads were translated, and ancient translations were lost. Although scholars had indirect access to his philosophy through the works of Proclus, St. Augustine, and Macrobius, among others, it was not until 1492 with the publication of the first Latin translation of the Enneads by the humanist philosopher Marsilio Ficino (1433–1499) that Plotinus was reborn to the Western world. Ficino’s translation was...