Æ22 - Dioskourios

Byzantion's bronze coinage of this period reflects the city's peculiar political position — nominally autonomous but perpetually squeezed between Macedonian successor ambitions and the relentless pressure of Celtic tribes who had settled in Thrace. Around 278–277 BC, the Galatian incursions had forced many Thracian cities into emergency monetary decisions; by the time this piece was struck, Byzantion had survived that crisis and was leveraging its chokehold on Bosporan grain traffic into genuine civic wealth.

The SNG Copenhagen 490 reference places this squarely within a well-documented civic series, though die linkage studies suggest smaller production runs than the type's relative availability might imply.