Æ18 - Valerian and Gallienus ΤΙΑΝΩΝ

Tium was a minor Bithynian coastal city whose civic coinage output was modest even by provincial standards, and joint issues naming both Valerian and Gallienus as co-emperors narrow the window of production to the period before Valerian's capture by Shapur I at the Battle of Edessa in 260 — an event that effectively ended his reign and almost certainly halted any coinage struck in his name. The city's ethnic ΤΙΑΝΩΝ confirms attribution to Tium rather than the more prolific neighboring mints at Prusias or Nicaea.