a disciple of Apollodorus of Pergamus. (Senec. Controv. 2.13. p. 184.) As he is mentioned only in this passage of Seneca, his name has given rise to considerable dispute. Spalding (ad Quintil. 3.1.18) conjectures that he was the son of M. Vipsanius Agrippa, who married the daughter of T. Pomponius Attics, and that he had the surname of Atticus in honour of his grandfather. Frandsen (M. Vipsanius Agrippa, p. 228), on the other hand, supposes him to have been the father of Vipsanius Agrippa. But both of these conjectures are unsupported by any evidence, and are in themselves improbable. We are more inclined to adopt Weichert's opinion (Caes. Augusti, &c. Reliquae, p. 83), that, considering the imperfect state of Seneca's text, we ought to read Dionysius in this passage instead of Vipsanius. [ATTICUS, DIONYSIUS.] (Comp. Piderit, De Apollodoro Pergameno, &c. p. 16, &c.)