Æ24 - Valerian and Gallienus ΠΡΟΥϹΑΕΩΝ

Prusa ad Olympum, nestled at the foot of Mount Olympus in Bithynia, was a prosperous city that retained the right to strike local bronze under the joint reign of Valerian and Gallienus — a period of almost unrelenting military crisis during which the empire simultaneously faced Sassanid invasion in the east and Gothic incursions across the Danube. Valerian's capture by Shapur I at Edessa in 260 AD effectively ended the co-reign in practice, making issues attributable to the later portion of this window considerably rarer than those from its opening years.