Reign of Gallienius. Historical Context: P. Licinius Egnatius Gallienus, son of Valerian, was made co-emperor in 253 AD soon after his father elevation. After the capture of Valerian by the Persians, Gallienus became a ruler of the whole empire subject not only to fierce barbarian attacks, but rent by internal revolts, famine and plagues. Gallienus was murdered at the siege of Milan. Obv: Gallienius,Rev: Securitas, Roman "Security," holding spear,Diameter: 19 mm diameter (almost the size of a US Penny),Condition: Very Fine.