Amisus held the status of a free city — *eleutheras*, as the legend states — a privilege granted under Pompey's reorganization of Pontus in 65 BC and jealously maintained through successive imperial administrations. That autonomy allowed the city to strike bronze coinage in its own name during the joint reign of Valerian and Gallienus, a period when the empire was fracturing under simultaneous pressure from Shapur I on the eastern frontier and a cascade of usurpers in the west. Valerian himself was captured by the Sassanids in 260, the only Roman emperor ever taken prisoner in battle — the precise event that closes the date range on this issue.
Amisus held the status of a free city — *eleutheras*, as the legend states — a privilege granted under Pompey's reorganization of Pontus in 65 BC and jealously maintained through successive imperial administrations. That autonomy allowed the city to strike bronze coinage in its own name during the joint reign of Valerian and Gallienus, a period when the empire was fracturing under simultaneous pressure from Shapur I on the eastern frontier and a cascade of usurpers in the west. Valerian himself was captured by the Sassanids in 260, the only Roman emperor ever taken prisoner in battle — the precise event that closes the date range on this issue.