Amyntas I of Macedon

Amyntas I (Ancient Greek: Ἀμύντας) was king of the ancient Greek kingdom of Macedonia from at least 512/511 until his death in 498/497 BC. Although there were a number of rulers before him, Amyntas is the first king of Macedonia for which there is any reliable historical information. During Amyntas' reign, Macedonia became a vassal state of the Achaemenid Empire in 510 BC.

Source: Wikipedia — https://en.wikipedia.org/wiki/Amyntas_I_of_Macedon