Cersobleptes (Ancient Greek: Kερσoβλέπτης, romanized: Kersobleptēs, also found in the form Cersebleptes, Kersebleptēs) was the son of Cotys I, king of the Odrysians in Thrace, on whose death in September 360 BC he inherited the throne.
He inherited a conflict with the Athenians and with the rebel former royal treasurer Miltokythes from his father, and then there appeared two rivals for the throne, Berisades and Amadocus II.
In 357–356 BC, Philip II of Macedon began to expand at expense of his eastern neighbors, taking advantage of a rebellion among the allies of Athens to seize Amphipolis and Crenides, which he renamed after himself "Philippi", as well as the gold mines of Mount Pangaeum.
[8] Athens began to plant cleruchies in the Chersonese, while Cersobleptes attacked both Amadocus II to his west and the Greek cities of Perinthus and Byzantium to his east.
[11] After an apparent lull in hostilities, in 347–346 BC Cersobleptes appears to have sought Athenian support again, and Athens installed additional garrisons in the coastal cities of Thrace, perhaps provoking a Macedonian campaign under Philip's general Antipater.
Sometime in this period, in unknown circumstances, the Thracian kings Teres III and Cersobleptes had been eliminated or subjugated, and the towns of Philippopolis and Cabyle were established as Macedonian colonies.