Coinweek - Fearful of Athens and the growing power of the Macedonian Kingdom, Olynthus and the other free cities of the Chalcidice banded together in 432 BC, forming the Chalcadian League as a defensive coalition. Athens failed to break up this union due to its focus on the Peloponnesian War and its general disinterest in the region, helping solidify the strength of the League.

The capital was placed at Olynthus on a peninsula of northern Ancient Greece, on the shores of the Aegean Sea. The name Olynthus originates from the Greek "olunthos", a fig which matures early, as this fruit was plentiful in the area.
The Chalcadian League was at the height of its power in the late fifth century BC but soon became the center of conflict. In 393 BC, Amyntas III of Macedonia was under attack by the Illyrians and temporarily transferred territory to Olynthus for protection. When he regained control, the League refused to return his lands and he called upon Sparta to intervene. At the same time, there was unrest in the League and some members claimed that they were being forced to remain in the League against their will.
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