Æ23 - Gallienus (sole reign) (ΕΠΙ ΔΙΟΓΕΝΟΥϹ ΔΙΟΝΥϹ(ΙΟΥ) / Α-Ρ(Χ) / ΚΟΤΙΑΕΩΝ

Cotiaeum, a mid-sized Phrygian city on the road between Synnada and Dorylaeum, struck coins under local magistrates whose names appear in the legends — here, Diogenes Dionysios, whose title ΕΠΙ marks him as the presiding civic official responsible for the issue. These civic bronzes proliferated across Asia Minor precisely because Gallienus, consumed by near-continuous usurpations and frontier crises after Valerian's capture by Shapur I in 260, exerted minimal centralizing control over provincial mints.

The abbreviated magistrate legend across obverse and reverse fields is characteristic of Cotiaeum's later civic issues, where die-cutters distributed the inscription unconventionally around the design rather than in a continuous arc.