ire of Philip II of Macedon by joining the kings of Paeonia and Illyria against him, leading to Philip's victory over the allies and the expansion of Macedonian influence in this part of Thrace. From a passing reference in Demosthenes' oration, it appears that by 354 or 353 BC Philip II was at Maroneia, negotiating with Cersobleptes' envoy Apollonides, apparently planning for a joint attack against Amadocus II and the Athenian holdings in the Chersonese; the Theban general Pammenes was also involved. However, the plans failed, and Cersobleptes allied with Athens in exchange for Athens removing its protection from Amadocus II. 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. Provoked by Cersobleptes' alliance with Athens, Philip II now invaded Cersobleptes' kingdom as an ally of Perinthus and Byzantium in 352 BC. Cersobleptes was defeated and had to send one of his sons as hostage to Philip's court at Pella. Philip appears to have annexed the lands of the sons of Berisades, who may have been the Thracian brothers who are said to have invited him to settle their disputes; Amadocus II disappears as well, perhaps deposed by either Philip II or Cersobleptes, and at any rate succeeded by Teres III. 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. When Athens attempted to include Cersobleptes in a peace with Philip II in 346 BC, the proposal was rebuffed, and Philip proceeded to campaign in Thrace, expelling Athenian garrisons from the coastal towns. Several years later, in 342–340 BC, Philip II led a more substantial campaign into Thrace. By early 341 he had overrun the coast, passed through Cardia, Aenus and taken Cabyle. The remainder of the campaign brought Philip into the lands beyond Mount Haemus and into conflict with the Getae and contact with the Scythians. 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. By 340 BC, Philip II was laying siege to Perinthus and Byzantium. According to an inscription from Delphi (FD III.1 392), dated to 355 BC,