“The Roman Empire necessarily became less Roman as it became more of an Empire; until not very long after Rome gave conquerors to Britain, Britain was giving emperors to Rome. Out of Britain, as the Britons boasted, came at length the great Empress Helena, who was the mother of Constantine. And it was Constantine, as all men know, who first nailed up that proclamation which all after generations have in truth been struggling either to protect or to tear down”