Æ27 - Trajan Decius PROVINCIA DACIA, AN IIII

Provincia Dacia was one of the few Roman provincial entities permitted to operate its own dated coinage, running an internal year count — the AN series — that began in 246 AD under Philip I, who created the province as a consolidated administrative unit from the three older Dacian districts. AN IIII places this piece in 249–250, the opening months of Trajan Decius's reign, a man who himself had Danubian roots and whose provincial connections made him unusually attentive to the region.

The series is notable for its unbroken continuity through rapid imperial succession — Philip I, Philip II, Trajan Decius, and Trebonianus Gallus all appear within it, the annual date providing an administrative anchor regardless of who held Rome.