Tetrobol

Ainos sat at the mouth of the Hebros River on the Thracian coast, a position that made it commercially vital and strategically contested. The city's silver coinage — issued across a relatively narrow window before Thracian and later Macedonian pressures curtailed its independence — draws from the rich trade networks connecting the Aegean to the Thracian interior. The tetrobol denomination served everyday mercantile exchange rather than large transactions, and surviving examples circulated hard.

May's die study remains the authoritative reference for this series, with #364 placing this type precisely within the sequence of magistrate-controlled issues from the early fourth century.