Æ34 - Antoninus Pius L ΙΗ

Year 18 of Antoninus Pius (154–155 AD) falls squarely within the most administratively stable stretch of the entire Principate. Alexandria's civic mint operated under the prefect of Egypt, a Roman appointee who answered directly to the emperor — no senate intermediary, no provincial governor between them. The Alexandrian bronze series ran on a regnal-year dating system unique in the Roman world, making precise attribution straightforward where other provincial issues are not.

The L ΙΗ designation — Greek for "year 18" — anchors this piece to a single twelve-month Egyptian fiscal cycle beginning in late August 154.