Paeonians were an ancient Indo-European people that dwelt in Paeonia. Paeonia was an old country whose location was to the north of Ancient Macedonia, to the south of Dardania, to the west of Thrace and to the east of Illyria, most of their land was in the Axios (or Vardar) river basin, roughly in what is today North Macedonia. The Paeonians lived from the middle to the lower Vardar river basin in antiquity. The first Paeonian settlement to be mentioned in antiquity is Amydon by Homer in the Iliad. To the north and west the Paeonians bordered Illyrian peoples but these borders were unstable. In particular, the border with the Dardani seems to have shifted several times between Gradsko (Stobi) and Bylazora. The capture of Bylazora in 217 BCE by Philip V partly stabilized the northern Dardanian-Paeonian frontier. To their east, the Paeonians bordered Thracian peoples along the Bregalnica river, which seems to have formed the natural border between the Maedi and the Paeonians. Along the Lakavica river, a left-bank tributary of the Bregalnica, it is most likely Paeonian settlements were distributed. Their territory extended to the southeast up to the upper Strumica river basin (roughly the area of modern Strumica municipality) and bordered Sintice. An important Paeonian settlement in this region was Doberus which is mentioned in 429 BCE in the Odrysian campaign against Macedon by Sitalces. To their west and southwest along the Crna Reka river, the Paeonians who themselves proably occupied the lower Crna Reka border a number of Illyrian and upper Macedonian or Pelagonian peoples, while to the south the Brygian town of Skydra or Kydra was situated. To the south, Paeonians bordered Macedonians. Before 1000 BCE, Paeonians must have settled in the lower Vardar basin as far south as Mygdonia where Strabo places them in an area known as Amphaxitis. The expansion of the Macedonian state during the 4th century BCE resulted in the foundation of several new cities in southern Paeonia including Idomenae and Antigonia.