originally a praetor's counsel (Heinccc. Antiq. Rom. 4.6.9), was promoted by Galba, A. D. 70, to the posts of courtchamberlain and praetorian prefect. Of the three favourites of Galba, who from their influence with him were called his pedagogues (Suet. Galb. 14; D. C. 64.2), Laco was the most slothful and not the least arrogant. In the disputes concerning the appointment of a colleague and successor to Galba, Laco opposed the nomination of Otho, and moved, it is said, by his intimacy with Rubellius Plautus, supported that of Piso. In the divisions of Galba's court and favourites Laco seems to have taken part with Icelus. [ICELUS.] Galba wished to send Laco to appease the discontent of the legions under Vitellius in Germany; but he refused to go, and was thought to have contributed to his patron's destruction by concealing from him the murmurs of the soldiery, and by advising him, when the praetorians had declared for Otho, to present himself to the mutineers. On Otho's accession Laco was ordered for deportation; but the centurion who guarded him had secret orders to put him to death on the way. Laco, however, according to Plutarch (Plut. Galb. 13), perished at the same time with Galba. (Tac. Hist. 1.6, 13, 14, 19, 26, 33, 46; Suet. Galb. 14; Plut. Galb. 13, 26, 29.)