Reigned 259 to 268. Confessor; probably Greek; died at Rome, Italy. During the Decian persecution the Holy See was vacant for nearly a year. When the persecution ceased through the edict of Gallienus, Dionysius was elected pope and the Church was given a legal existence. He organized the administration of the Church, called a synod at Rome to settle doctrinal matters, and issued a letter condemning the Sabellian heresy. Feast, 30 December.