Æ20 - Valerian and Gallienus ΛΑΝΨΑΚΗΝΩ

Lampsacus, positioned on the Hellespontine shore, was among the Greek cities of Mysia that retained the right to strike bronze civic coinage under Roman imperial oversight well into the third century. The joint naming of Valerian and Gallienus as co-emperors — father and son ruling simultaneously from 253 — gave provincial mints a narrow window for exactly this kind of dual-authority issue, one that closed when Valerian was captured by Shapur I at the Battle of Edessa in 260, leaving Gallienus to reign alone.