Æ30 - Valerian and Gallienus ΕΠΙ Ϲ ΒΑΛ ΑΡΙϹΤΟΜ/ΑΧΟΥ / ΜΥ/ΤΙΛΗ/ΝΑΙΩΝ

Mytilene's civic bronze coinage under the joint reign of Valerian I and Gallienus belongs to the last sustained phase of Greek imperial production on Lesbos — a tradition that would effectively collapse with the wider disruption of the 260s. The magistrate name preserved in the legend, Bal. Aristomachos, anchors this piece administratively to the Pergamene conventus, the Roman judicial circuit through which provincial civic minting was implicitly licensed.

Valerian's capture by Shapur I at Edessa in 260 abruptly ended the joint reign dynamic that defines this issue's chronological bracket.