Persecution
Persecutions ended under Emperor Gallienus, who issued an edict of tolerance, and returned land back to the Christians. This peace lasted for over 40 years until 303 AD.Excommunication
He threatened to excommunicate the bishop of Alexandria, also named Dionysius, as a heretic on the subject of the Trinity. At the resulting synod, the bishop was found not to be a heretic, and was not excommunicated.Paying ransom
He sent large sums of money to the areas ravaged by the Persians, to ransom captured Christians.Death
He died of natural causes on 26 December 268.253-260: Roman Emperor, Valerian
253-268: Roman Emperor, Gallienus
268: Goths sack Athens, Sparta, Corinth
268-270: Roman Emperor, Claudius II (the Goth)