Plutarch's Timoleon has received little attention from scholars who in recent years have studied the sources of his Lives and sought to determine the methods which he followed in their composition. The reasons for this neglect are obvious: the Timoleon is a simple Life, contains few citations, and is universally and justifiably believed to be founded, together with the Timoleon of Cornelius Nepos, upon the tradition established by Timaeus. Scholars of the nineteenth century agreed in further concluding that both authors derived their material directly and almost exclusively from Timaeus. This conclusion does not appear to have been challenged in spite of the well-known contention of Eduard Meyer, which has won considerable approval, that neither biographer was accustomed to use primary historical authorities, each relying mainly upon biographies of the Hellenistic period which have not survived. The validity of Meyer's theory as a general principle of source-criticism will not be expressly discussed in this paper. My purpose is rather to examine the Timoleon only, especially in relation to the Timoleon of Nepos, and to suggest a method of composition here adopted by Plutarch, who, I believe, based his Life upon a secondary biography and supplemented this from a primary historical authority.