In its first three centuries, Christianity spread rapidly, but at the time of Constantine’s conversion, less than 10% of the population of the Roman Empire was Christian. Three centuries later, the overwhelming majority of the Roman and post-Roman world were Christian, and adherents of the old gods (paganism) had declined to 10% or less of the population. Imperial patronage clearly changed Western history decisively. John Hamer of Toronto Centre Place will look at the life of Constantine, the first Christian Emperor of Rome, and the many ways his conversion changed the Roman Empire and transformed his adopted religion, Christianity.