2. Son of Lysimachus, grandson of the preceding, is in Plato's Laches represented as brought by his father to Socrates as a future pupil. In the Theaetetus Socrates speaks of him as one of those who made rapid progress while in his society, but, after leaving him prematurely, lost all he had gained; an account which is unskilfully expanded and put in the mouth of the young man himself by the author of the Theages. That of the Theaetetus in the main we may take to be true. (Plat. Laches, p. 179a, &c. Theaet.p. 151a; Theag. p. 131a.)