Nummus - Diocletian Draped and cuirassed bust from behind, IMP DIOCLETIANVS P F AVG, GENIO POPVLI ROMANI, Londinium

Struck at the Londinium mint during Diocletian's final years before his abdication in 305 — the only Roman emperor to voluntarily relinquish power and survive — this nummus belongs to the post-reform coinage introduced under the currency reforms of circa 294, which attempted to stabilize a denominations system that had been collapsing for decades. Londinium was one of the newer mints activated under Diocletian's tetrarchic reorganization, established specifically to serve the western provinces under Maximian and later Constantius I.

RIC VI 24 is a scarcer London type within this GENIO series, partly a function of the mint's relatively short active window in this period.