Æ20 - Valerian and Gallienus COL AVG TROAD

Alexandria Troas operated its colonial mint with unusual autonomy into the joint reign of Valerian I and Gallienus, one of the last active provincial bronze mints in the region before Gallienus effectively ended the Roman provincial coinage system around 268. The city's colonial status — granted originally under Augustus — gave it the right to strike bronze independently, a privilege it exercised stubbornly long after neighboring mints had gone dark.

The Conventus of Adramyteum was an administrative judicial circuit, not a minting authority; Alexandria Troas simply fell within its boundaries for Roman administrative purposes.