Valerian II - Caesar of Imperium Romanum from 253 to 257
Publius Licinius Cornelius Valerianus was the eldest son of Roman Emperor Gallienus and Empress Cornelia Salonina.

Shortly after his acclamation as Emperor, Valerian I made Gallienus his co-Emperor and his grandson, Valerian II, Caesar. He was placed in the care of one Ingenuus, who seems to have held an extraordinary command as governor of the Illyrian provinces.

In 257, Valerian II died under circumstances sufficiently suspicious for Gallienus to attempt to demote Ingenuus. It was this action that sparked the attempted usurpation of the Empire by Ingenuus, who had widespread support among the Illyrian garrisons and the provincial establishment.
Valerian II
Caesar Valerian II of the Roman Empire

(1) Valerian II 258 AD
Obverse: radiate head right; DIVO CAES VALERIANO
Reverse: altar with flame above, divided in four squares with a dot inside of each square; CONSECRATIO
Ref: RIC V 24; MIR 36, 261g; RSC 12
(2) Valerian II 255-256 AD
Obverse: radiate, draped and cuirassed bust right from behind; VALERIANVS NOBIL CAES
Reverse: Valerian II standing half right with head left, crowning trophy to the left with wreath holding shield and spear; PRINC IVVENT_VTIS
Ref: Göbl MIR 1694b, RIC V 49, RSC IV 67...