Cethegus, i, m., a Roman cognomen in the Cornelian gens. M. Cornelius Cethegus, a distinguished orator, Cic. Sen. 14, 50; id. Brut. 15, 59 al.; to him Horace alludes in the passage: priscis memorata Catonibus atque Cethegis, Hor. Ep. 2, 2, 117; cf. id. A. P. 50.

— C. Cornelius Cethegus, companion of Catiline, Cic. Cat. 3, 3, 6; Sall. C. 32, 2; 43, 2.

—Prov.: Clodius accuset moechos, Catilina Cethegum, Juv. 2, 27; cf. id. 8, 231; 10, 287.