Æ21 - Valerian and Gallienus COL G IVL H PAR

Parium, a Mysian colony on the Propontis, retained the right to strike bronze coinage well into the imperial period — a privilege that reflected the city's administrative standing rather than any economic necessity. The joint reign of Valerian and Gallienus, which began in 253, was marked almost immediately by catastrophic military pressure on multiple frontiers simultaneously, and provincial mints like Parium continued operating through this chaos largely on civic momentum.

Valerian's capture by Shapur I at Edessa in 260 effectively ended the joint reign as a functioning political reality, placing a hard terminus on this issue.