Æ31 - Valerian and Gallienus ΤΡΑΛΛΙΑΝΩΝ

Tralles, a prosperous city in the Maeander valley, maintained active civic bronze coinage well into the third century, using joint imperial titulature as a form of political alignment with whoever held power in Rome. The pairing of Valerian and Gallienus as co-emperors — father and son ruling simultaneously after 253 — gave provincial mints a narrow window in which dual-portrait civic issues were appropriate, closed abruptly when Valerian was captured by Shapur I at the Battle of Edessa in 260, the only Roman emperor ever taken prisoner in battle.