Domitianus II - Augustus (usurper) of Imperium Galliarum from 271 AD to 271 AD
Domitianus was probably a Roman soldier of the mid-third century AD who was acclaimed emperor, probably in northern Gaul in late 270 or early 271 AD, and struck coins to advertise his elevation.

Given that his reign lasted for, at best, only a few weeks after his acclamation and he does not seem to have secured significant military or political support Domitianus is more properly categorized as a Roman usurper rather than an emperor.

The only evidence for Domitianus derives from two coins. The first was part of a hoard discovered at Les Cléons, in the commune of Haute-Goulaine in the Loire area of France in 1900. The other coin was found fused in a pot with some 5,000 other coins of the period 250-275 — thus providing incontrovertible provenance — in the village of Chalgrove in Oxfordshire, England, in 2003.
Domitianus II
Emperor (usurper) Domitianus II of the Gallic Empire