With the accession of the philosopher-emperor Marcus Aurelius, who was rendered hostile to the new doctrine not only by his own stoical convictions, but also because politically he viewed the Christians with disfavour, came the next great persecution; and persecution was their portion thereafter for some sixty years, under four reigns, until the accession of Alexander Severus in the third decade of the third century of the Christian era. Alexander’s mother, Julia Mannea, is believed to have been instructed in the new doctrine by Origen, the Alexandrian, although her conversion to Christianity and her ideas upon it do not appear to be greatly in advance of those of Adrian, for she is said to have included an image of Christ in the group of beneficent deities set up in her _lararium_.[2] For twenty years the Christians now knew peace and enjoyed the fullest liberty. Upon that followed a period of severe oppression, initiated by Decius, continued by Valerian and Aurelian, and reaching something of a climax under Diocletian, in the dawn of the fourth century, when the Christians endured the cruellest and most ferocious of all these persecutions. But the end of their sufferings was at hand, and with the accession of Constantine in 312 a new era began for Christianity. Constantine, upheld by the Christians as their saviour, in admitting the inevitable predominance which the new religion had obtained in rather less than three hundred years, was compelled to recognize the rights of its votaries not only to existence but to authority. Legends surround the history of this emperor. The most popular relates how, when he was marching against Maxentius, his rival for the throne, desponding in the consciousness of his own inferior force, there appeared at sunset a fiery cross in the heavens with the inscription ΕΝ ΤΟΓΤΩ ΝΙΚΑ--IN THIS SIGN YOU CONQUER. And it is claimed that as a consequence of this portent, whose injunction he obeyed, he sought instruction in Christianity, was baptized and made public avowal of that faith. Others maintain that he was reared in Christianity by his mother, St. Helena--she who made an expedition to the Holy Land to recover the true cross, and who is said to have built the Church of the Holy Sepulchre in Jerusalem; whilst others still assert that Constantine did not receive baptism until at the point of death, and that throughout his life, whilst undoubtedly favouring Christians, he continued in the pagan religion in which he had been educated by his father.