Valerian - A.D. 257 - Billion Antoninianus - P M TR P V COS IIII P P - RIC # 277

This coin type is an imitation of the Caius & Lucius Caesar reverse of Augustus issued some 200 years earlier & remarks on the joint Consulate of Valerian & Gallienus in 257 A.D.

Imperator Valerianus Augustus. Supreme commander Imperator Valerianus, emperor Augustus

Pontifex Maximus, Tribunicia Potestate Quinta, Consul Quartum, Pater Patriae. High priest, holder of tribunician power for 5th time, consul for 4th time, father of the nation