Peltast fighting used by peltasts originated in Thrace and the first Greek peltasts were recruited from the Greek cities of the Thracian coast. They are generally depicted on vases and in other images as wearing the typical Thracian costume, which includes the distinctive Phrygian cap made of fox-skin and with ear flaps. They also usually wear a patterned tunic, fawnskin boots and a long cloak, called a zeira, decorated with a bright, geometric, pattern. However, many mercenary peltasts were probably recruited in Greece. Some vases have also been found showing hoplites (men wearing Corinthian helmets, greaves and cuirasses, holding hoplite spears)
Thracian warfare tribal wars also kept Thrace from becoming a major regional power due to the lack of a central government. At the onset of the Peloponnesian War, the Thracian tribes were united under the rule of Sitalces, king of the Odrysae. It was allied with Athens during the conflict. However, the kingdom was again split into different parts after the death of king Seuthes. It was during this time when Philip of Macedon conquered a large swath of Thrace, absorbing the territory and its tribes into Macedon. The "Odrysian kingdom" (Ancient Greek, "Βασιλεία Όδρυσων") was a union of Thracian tribes that