Amyntas III (or II), son of Arrhidaeus, grandfather of Alexander the Great, was king of Macedon from 393 (or 389) to 369 BC.
He came to the throne after the ten years of confusion which followed the death of Archelaus II, the patron of art and literature. But he had many enemies at home; in 383 he was driven out by the Illyrians, but in the following year, with the aid of the Thessalians, he recovered his kingdom.
He concluded a treaty with the Spartans, who assisted him to reduce Olynthus (379). He also entered into a league with Jason of Pherae, and assiduously cultivated the friendship of Athens.
By his wife, Eurydice, he had three sons, the youngest of whom was the famous Philip II of Macedon.
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