This edition presents a radically improved text of Diogenes Laertius' Lives of Eminent Philosophers. The text is accompanied by a three level apparatus. A lengthy introduction list all the manuscripts of Diogenes' Lives and discusses its transmission in Late Antiquity and Medieval and Renaissance Periods. There is also a index of personal names, a bibliography and some notes which cover several features of the text and its interpretation. Tiziano Dorandi has used the Nachlaß of Peter Von der Mühll, for the first time in its entirety, to verify and consolidate material that he had previously gathered. This is by far the most detailed and elaborate edition which Diogenes' Lives – a work unique in his kind, and which has had a profound influence on European literature and philosophy – has ever received.