Nummus - Diocletian Cuirassed, IMP C DIOCLETIANVS P F AVG, GENIO POPVLI ROMANI, Londinium

The London mint opened around 286 AD under the usurper Carausius, who needed a local source of coinage to sustain his breakaway British empire. When Constantius I retook Britain in 296 and reintegrated it into the Tetrarchic system, the mint continued operating — shifting allegiance almost overnight to issue coins in Diocletian's name. This piece belongs to that early post-reunification phase, when the London facility was still establishing its Tetrarchic output and die quality remained inconsistent across officinae.