Proper noun
English Wikipedia has an article on:GallienusWikipedia
Gallienus
a Roman Emperor with his father Valerian from 253 to 260 and alone from 260 to 268
Accounts tell of people hearing the news of the new Emperor, and reacting by murdering Gallienus' family members until Claudius declared he would respect the memory of his predecessor. Source: Internet
Although Gallienus had already inflicted some damage on them at the Battle of Nestus, Southern, pg. 109 Claudius, not long after being named Emperor, followed this up by winning his greatest victory, and one of the greatest in the history of Roman arms. Source: Internet
After the reign of Gallienus and 20 or 30 years had passed, the multiplication of the animals had risen to such an extent in parts of the empire that they made it a crying evil. Source: Internet
After four years of delay, Postumus had established power, but in 265, when Gallienus and his men crossed the Alps, they defeated and besieged Postumus in an (unnamed) Gallic city. Source: Internet
But because Heraclianus was not actually in the east in 268 (instead, at this time, he was involved in the conspiracy of Gallienus' death), we can see that this can not be correct. Source: Internet
At the time, it was known as the Year of the Consulship of Gallienus and Sabinillus (or, less frequently, year 1019 Ab urbe condita ). Source: Internet