Æ25 - Valerian and Gallienus ΤΙΑΝΩΝ

Tium was a minor Bithynian coastal city whose civic coinage output was modest even by provincial standards, and joint-reign issues naming both Valerian and his son Gallienus as co-emperors fall within a narrow seven-year window before Valerian's capture by Shapur I at the Battle of Edessa in 260 — the only time a sitting Roman emperor was taken prisoner by a foreign enemy. That catastrophe effectively ended the joint reign and halted whatever remained of Tium's imperial bronze production under this pairing.