2. An historical writer, of uncertain date. Stephanus of Byzantium frequently quotes from a work of his, entitled (s. v. Ἀλτος, Βάλλα, &c), as also from another entitled (s. v. Κασταλία). It is, perhaps, this same Theagenes, who wrote a work on Aegina, quoted by Tzetzes (ad Lycoph. 176 ; Schol. Pind. N. 3.21; Clinton, Fasti Hellen. vol. ii. p. 369, note 1).