reforming emperor, who launched the last great Roman persecution of the Church. Diocletian had been content to tolerate Christianity for twenty years (his wife and daughter were probably Christians) but his Caesar (military second-in command), Galerius, was a fanatical pagan, and Christianity was clearly an obstacle to Diocletian’s vision of a reformed empire based on a return to traditional (that is pagan) values. In 298, pagan priests conducting the auguries at Antioch complained that the presence of Christian officials was sabotaging the ceremonies (the Christians had defended themselves from demons during the ceremony by making the sign of the cross). This was enough to trigger a confrontation which had been long brewing, and the persecution commenced. The aim at first was to oust Christians from the civil service and army, to close down and destroy churches, and to compromise the clergy. Under Galerius’ influence, the persecution escalated and became a bloodbath. The toll was worst in the East and in North Africa, with most of the West relatively unscathed, but Rome was scandalised by the cowardly surrender of Pope Marcellinus, and the legacy of the persecution was to be a permanent schism in the African church over the question of communion with the lapsed. Christianity, however, was now too entrenched in the empire to be stamped out in this way. Galerius,who had succeeded Diocletian on the latter’s retirement in 305, died in 311. He detested Christianity, but he was forced to issue an edict of toleration for Christians on his deathbed. And in the following year the fortunes of the Church changed irrevocably with the accession of Constantine as emperor.
Constantine had been declared emperor by the troops at York in 306 on the death of his father, Constantius, commander-in-chief of the imperial armies in the West. Like his father, he had originally worshipped Sol Invictus, the Unconquered Sun, but his mother Helena was a Christian, and his sister Anastasia’s name means ‘Resurrection’. Constantine himself now moved towards Christianity. He achieved mastery of Rome in October 312, defeating the rival Emperor Maxentius at the Milvian Bridge outside Rome. Constantine attributed this improbable victory to divine intervention, but just which divinity he credited is a matter of debate. Years later he told the historian Eusebius that while still in Gaul he had prayed before battle to Sol Invictus for help. Next day he had seen in the sky a cross of light, and the words ‘In this [sign] conquer.’ For his struggle with Maxentius Constantine had banners made bearing this ‘labarum’, the cross being formed by the Greek monogram for Christ, the Chi Ro: the emblem was painted on the shields of his soldiers.
Constantine was not a sophisticated man, and this identification of the Unconquered Sun with Christ seems to have presented him with no problems. By 312, however, Constantine was certainly widely believed to be a Christian. When the Arch of Constantine was erected to commemorate his victory over Maxentius the inscription prudently omitted any mention of the ‘Immortal Gods’, vaguely attributing his triumph to the ‘prompting of the Divinity’. His conversion to Christianity was probably gradual. The Chi Ro symbol would not appear on his coins until 315, and for five years after his accession Constantine continued to issue coins depicting himself as a devotee of the Unconquered Sun, or carrying images of the pagan gods.
From the moment of his accession, however, the fortunes of Christianity throughout the empire changed for ever. Whatever the state of his private conscience, Constantine had identified the Church not as the principle obstacle to unity and reform, but as its best hope. Christianity would provide imperial Rome with the common set of values and the single cult which it so badly lacked. From a persecuted sect, Christianity became the most favoured religion. A stream of edictsgranted religious