Marcus Cassianus Latinius Postumus proclaimed himself Augustus and founded the 'Empire of Gaul' in AD 260. He was the only Gallic emperor to mint coins in all three metals at Cologne, Trier, Lugdunum and Mainz, some coins bearing the legend Roma Aeterna. Silver coinage from this period is extremely debased, however some of the obverse portraits show outstanding classical artistry.
Postumus had an extensive series of antoniniani with the obverse legend IMP C M CASS LAT POSTVMVS P F AVG - coins from the first series are rare and bear the misspelt legend POSTIMVS. The second series (until the mid-sixties) display the legend IMP C POSTVMVS P F AVG on the obverse (shown above), with a variety of reverse motifs and legends. In 269, after quelling a revolt of Laelian, Postumus was murdered by his own troops in retaliation for denying them to sack the city of Mainz.

Obv. Postumus radiate right, IMP. C. POSTVMVS P. F. AVG.
Rev. Uberitas standing, holding a purse and cornucopiae, VBERITAS AVG.