(Θεμιστογένης), of Syracuse, is said by Xenophon (Xenoph. Hell. 3.1.2) to have written a work on the Anabasis of Cyrus ; but most modern writers, following the statement of Plutarch (de Gloria Athen. p. 361), suppose that Xenophon really refers to his own work, to which he prefixed the name of Themistogenes. It appears, however, that Themistogenes is not a fictitious name, since Suidas says (s. v.) that he wrote other works. (C. Miller, Fragm. Historic. Graec. vol. ii. p. 74, Paris, 1848.)
A Dictionary of Greek and Roman biography and mythology
Smith, William
A Dictionary of Greek and Roman biography and mythology. William Smith, LLD, ed. 1890