Æ24 - Valerian and Gallienus COL IVL CONC AVG APAM (or APAM AVG), D D

Apamea in Bithynia held the status of a Roman colony — Colonia Iulia Concordia — and this joint issue for Valerian and his son Gallienus reflects the co-emperorship arrangement formalized in 253 AD after Valerian's elevation following the death of Aemilianus. The abbreviation D D in the legend stands for *decreto decurionum*, indicating the local senate authorized the striking, a standard colonial privilege but one that makes provincial attribution unusually precise. Valerian was captured by Shapur I of Persia around 260 AD, effectively ending the joint reign and terminating issues of this type.