was one of the parties accused A. D. 48, when Messalina, the wife of Claudius, went so far in contempt of her husband as to marry the young eques, C. Silius. Tacitus says, that Caesoninus saved his life through his vices, and that on the occasion of Messalina's marriage he disgraced himself in the basest manner. (Tac. Ann. 11.36.)