Nummus - Valentinianus I SECVRITAS REIPVBLICAE, Constantinopolis

Valentinian I came to power in 364 AD through military election following the sudden death of Jovian, and within hours of his own acclamation he was pressured by the army to name a co-emperor — appointing his brother Valens to govern the East. The Constantinople mint operated under Valens's jurisdiction from that division onward, making this western emperor's coinage struck there a product of the fraternal power-sharing arrangement that defined the decade.

The SECVRITAS REIPVBLICAE type was the workhorse reverse of the period, issued across virtually every mint in both halves of the empire simultaneously as a coordinated statement of stability following years of dynastic turbulence under Julian and Jovian.