Here'nnius
9. C.
Herennius, to whom the treatise on rhetoric--
Rhetoricorum ad C. Herennium Libri IV.--is addressed, cannot be identified with any of the preceding or following Herennii (
ad Herenn. 1.1, 2.1, 4.1, 56). Respecting this work, see CICERO, p. 726, &c.