COTYS, king of Thrace from 383 to 36o B.C., disputed with the Athenians the possession of the Thracian Chersonese. H was assisted by the Athenians, Iphicrates and Charidemus, to the former of whom he had given his daughter in marriage. On the revolt of Ariobarzanes from Persia, Cotys opposed him and his ally, the Athenians. In 358 he was murdered.
See Cornelius Nepos, Iphicrates, Timotheus; Xenophon, Agesilaus; Demosthenes, Contra Aristocratem.