The two texts in this volume-Porphyry's On the Life of Plotinus and the Arrangement of His Works and Marinus's Proclus, or On Happiness-are fundamental for an understanding not only of Neoplatonism but also of the conventions of biography in late antiquity. Neither has received such extensive annotation before in English, and in his commentary Mark Edwards makes full use of recent scholarship. The essay-length introduction is intended both as a general guide to Neoplatonism as well as a survey of ancient biographical writing.