Nummus - Crispus as Caesar CRISPVS NOBIL C, VIRTVS EXERCIT, PLN, Londinium

Crispus, Constantine I's eldest son by his concubine Minervina, was elevated to Caesar in 317 AD and stationed in the west, where he proved himself an effective military commander — most notably crushing Licinius's fleet at the Battle of the Hellespont in 324. The VIRTVS EXERCIT reverse type was introduced across western mints around 320 as deliberate propaganda tying the Caesars to military virtue at a moment when war with Licinius was increasingly inevitable.

Crispus was executed by his own father in 326, his name subjected to damnatio memoriae. London mint production of his coinage ceased well before that end — the mint itself closed around 325.