Nummus - Constans I VOT XX MVLT XXX, Nicomedia

The VOT XX MVLT XXX legend commemorates Constans reaching his twentieth regnal vow while anticipating his thirtieth — struck as part of the wider celebration of the Constantinian dynasty's decennalia and vicennalia issues of 347–348. Nicomedia had been one of Diocletian's preferred imperial residences and retained a productive mint well into the fourth century. These small bronze nummi represent the terminal shrinkage of Roman bronze coinage, reduced so aggressively from the large follis of Diocletian's reform that by this point the flan barely accommodated the design.