AR19 - Diocletian L Δ

Diocletian's monetary reform of 296 AD — the same year this coin's production cycle ended — fundamentally restructured Egyptian coinage, abolishing the ancient Alexandrian tetradrachm system that had operated as a closed currency zone since the Ptolemaic period. Egypt had maintained its own denominational isolation for centuries, refusing standard Roman coin entry, and this issue falls in the final phase of that arrangement. The lambda-delta regnal date marks year four of Diocletian's reign as counted by the Alexandrian calendar, which began each year on 29 August.