(Ὀνόμαστος/Onómastos). Confidant and official of Philippus V [1. 109f.], as governor in Thrace in 185/4 BC he and Cassander actuated a bloody raid by the Thracians on pro-Roman Maronea  (Pol. 22,13,3-7; Liv. 39,34,2), which, however, Philippus protected from being handed over to Rome (Pol. 22,14,1-5; Liv. 39,34,6-10). In the Demetrius  high treason affair O. probably advised rigour (Liv. 40,8,4-6; cf. 16,1-3).
1 S. Le Bohec, Les 'philoi' des rois Antigonides, in: REG 98, 1985, 93-124.