Æ25 - Valerian and Gallienus PROVINCIA DACIA, AN X

Provincia Dacia was a Roman administrative invention for coinage purposes — a unified mint identity created around 246 AD under Philip I to serve the three real Dacian provinces collectively. The AN date on these coins refers to the province's own regnal era, making AN X the tenth year of that system, not a standard imperial dating. Valerian and Gallienus appear as co-emperors, a pairing that held from 253 until Valerian's capture by Shapur I at the Battle of Edessa in 260 — one of the most humiliating military disasters in Roman history.