Tetrobol

Ainos, a Thracian coastal city at the mouth of the Hebros River, issued coinage with remarkable consistency through the late fifth century despite sitting at the friction point between Athenian commercial interests and growing Macedonian pressure from the interior. The brief window of 408–406 BC places this tetrobol within a particularly volatile stretch, when Athenian naval dominance in the northern Aegean was fracturing following the Battle of Arginusae and its political aftermath.

May's die study remains the foundational reference for this series, identifying tight chronological sequences that SNG Copenhagen largely corroborates.