Gallienus 253-268 AD
Silvered antoninianus, 23 mm, 3.48 gm.
255 AD, refers to joint consulate of G. and Valerian.
Gallienus, the son of Valerian, was born in Milan and inhertited an Empire in chaos, his reign was marked by continuous Germanic invasions and rebellions among his regional commanders. He was murdered in a coup.