Hemistater - Eumelus / Spartocus III

The Bosporan Kingdom occupied a commercially vital position controlling grain exports from the northern Black Sea to Athens, and the Spartocid dynasty — nominally subordinate to the Athenians as client rulers — minted in gold precisely because that trade ran on Attic weight standards. This hemistater sits within the reigns of either Eumelus (309–304 BC) or Spartocus III (304–284 BC), an attribution problem the references have never fully resolved.

Eumelus is the more historically colorful candidate: ancient sources, particularly Diodorus Siculus, record that he seized power by murdering his brothers and then pursued an aggressive anti-piracy campaign in the Black Sea to court Greek favor.