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4th-century BCE founder and king of the Paeonian kingdomPaeonia,tribes and Environs
Agis (Greek: Ἄγις; died 358 BC) was founder and king of the Paeonian Kingdom. A contemporary of Philip II of Macedon, Agis was a pretender to the Macedonian throne in a time of instability. His successor was Lycceius.
References
The Cambridge Ancient History, Volume 6: The Fourth Century BC by D. M. Lewis, John Boardman, Simon Hornblower, and M. Ostwald, 1994, p. 463: "Agis, king of Paeonians"
