the Odrysians did not intervene in coastal Thrace, which had now become a contested battlefield between Athens and Sparta. Athens for its part began to make heavy use of Thracian mercenaries acting as light skirmishers, the peltasts. Due to their success the Greeks soon began to raise peltast units of their own. Still, the Athenians eventually lost the Peleponnesian war and, for a few years at least, much of their influence in the northern Aegean. Seuthes I was eventually succeeded by Amadocus I, also known as Medokos, in around 410 or 405 BC. First signs of decay and brief revival under Cotys I (404–360 BC) The civil wars between Amadocus I and Seuthes II By the turn of the 4th century the Odrysian kingdom showed its tendency towards fragmentation. Two rulers are known by 405: Amadocus I and Seuthes II. The historian Diodorus Siculus even called both of them "kings of the Thracians", although this is most likely a misunderstanding: by 405 Seuthes II still considered Amadocus I as his suzerein. Amadocus was the son of the previous king Seuthes I, while Seuthes II was the son of a Thracian chieftain named Maisades. Maisades was a descendant of king Teres, making Seuthes II and Amadocus I distant relatives. There was also an autonomous Odrysian prince in the western hinterlands of Byzantium named Teres. Initially raised at the court of Amadocus, Seuthes was sent to eastern Thrace several years before 405. By 405 he had managed to consolidate his position over a realm stretching from Apollonia Pontica over the Strandzha to parts of the northern Propontis coast. In 400 BC he hired Greek mercenaries under Xenophon to expand his dominion at the cost of Teres and other rebels, forcing them to reacknowledge the authority of Amadocus. Due to lacking funds they left his service already after two months. Seuthes II eventually rose against Amadocus, although little is known about this insurrection. In 389 the Athenian general Thrasybulus mediated between the two parties, resulting in Seuthes II, whom Xenophon called "ruler of the coast region", recognizing Amadocus' authority again. Amadocus, who had defied Seuthes' insurrection probably due to his own popularity, died soon after 389. His successor was Hebryzelmis, about whom very little is known, but who, like Amadocus, sought the good will of Athens. Seuthes II on the other hand allied with Sparta. An Athenian inscription from the year 386/5 confirms