Nummus - Constantinus I VOT XX DN CONSTANTINI MAX AVG, Siscia

The VOT XX type commemorates Constantine's vota, the formal public vows renewed every ten years of a reign — in this case the twentieth, falling around 320–321 AD. These vow coinage issues were not incidental: they were deliberate propaganda broadcasts, circulated widely to reinforce dynastic continuity at a moment when Constantine was systematically dismantling the remaining collegiate power of the tetrarchy. Licinius would fall in 324.

Siscia, modern Sisak in Croatia, was one of the busiest western Danubian mints of the period, retooled significantly after Diocletian's reforms.