Lucius Caecilius Firmianus Lactantius, a name eminent among patristic authors, and not inconsiderable in humane letters, had, like Cyprian, been a professor of rhetoric, and embraced Christianity in mature life. That he was a pupil of Arnobius is established by the testimony of Jerome; his African birth is only a doubtful inference from this fact. Towards the end of the third century he established a school at Nicomedia, which had practically become the seat of empire under the rule of Diocletian; and from there he was summoned to the court of Gaul to superintend the education of Crispus, the ill-fated son of Constantine. The new religion had passed through its last and sharpest persecution under Diocletian; now, of the two joint Emperors Constantine openly favoured the Christians, and Licinius had been forced to relax the hostility towards them which he had at first shown. As it permeated the court and saw the reins of government almost within its grasp, the Church naturally dropped some of the anathematising spirit in which it had regarded art and literature in the days of its earlier struggles. Lactantius brought to its service a taste trained in the best literary tradition; and while some doubt was cast on his dogmatic orthodoxy as regards the precise definition of the Persons of the Trinity, his pure and elegant diction was accepted as a model for later writers. His greatest work, the seven books of the _Institutes of Divinity_, was published a few years before the victory of Constantine over Maxentius outside the walls of Rome, which was the turning-point in the contest between the two religions. It is an able exposition of Christian doctrine in a style which, for eloquence, copiousness, and refinement, is in the most striking contrast to the wretched prose produced by contemporary pagan writers. The influence of Cicero is obvious and avowed throughout; but the references in the work show the author to have been familiar with the whole range of the Latin classics, poets as well as prose writers. Ennius, the comedians and satirists, Virgil and Horace, are cited by him freely; he even dares to praise Ovid. In his treatise _On Gods Workmanship_--_De Opificio Dei_--the arguments are often borrowed with the language from Cicero, but Lucretius is also quoted and combated. The more fanatical side of the new religion appears in the curious work, _De Mortibus Persecutorum_, written after Constantine had definitely thrown in his lot with Christianity. It is famous as containing the earliest record of the vision of Constantine before the battle of the Mulvian Bridge; and its highly coloured account of the tragical fates of the persecuting Emperors, from Nero to Diocletian, had a large effect in fixing the tradition of the later Empire as viewed throughout the Middle Ages. The long passionate protest of the Church against heathen tyranny breaks out here into equally passionate exultation; the Roman Empire is already seen, as it was later by St.