Ummm, I'm pretty sure it's because he was merely a wee lad when he became Caesar ... and then he was murdered (THE END) https://en.wikipedia.org/wiki/Saloninus
I don't think I posted my latest Postumus here so I'll add it to the pile: Postumus, Gallic Empire, AD 260-269 AR Antoninianus, 22mm, 3.0g, 6h; Trier mint, AD 260-261. Obv.: IMP C POSTVMVS P F AVG; Radiate, draped, and cuirassed bust right. Rev.: VICT-ORIA AVG; Victory advancing left, holding palm in left hand and wreath in right hand; captive at feet. The reverse type interested me - Victory advancing with captive at feet.
Cell phone picture of a Pile-o-Gallics I have yet to sort through: Looks like some interesting coins in there. John
Took a picture of one intriguing Gallienus from the group with a Neptuno reverse. This is a pretty cool Gallic to me. John
Why do you call a Gallienus a Gallic? He was a mainstream emperor centered in Rome. I'd save the term Gallic for Postumus, Victorinus, Tetricus and the rare guys in Gaul.
That is a good point Doug, I have to plead ignorance. The Gallienus I show was bought as part of a group of Tetricus I and II, Victorinus, and I think a few Postumus. They all have the same fabric and patina. I assumed they were all minted in Gaul. Would that make the coin Gallic even if the emperor was not? John