It is true, the great library of inestimable value collected by Ptolemy Philadelphus (who also purchased the large library of Aristoteles) had been ruthlessly destroyed in the Alexandrian war of Julius Cæsar. But Ptolemy Physcon collected a second valuable library, which was augmented by the splendid library of King Eumenes of Pergamus, and formed by far the grandest collection of books to be found in the world. Mark Antony gave this splendid library to Queen Cleopatra. It comprised the intellectual treasures of the ancient world, and was placed in a wing of the Serapeum,--in that gigantic and magnificent building which was the grandest temple of ancient Egypt and the pride of Alexandria. The great city of the Ptolemies, with a population of nearly a million souls, had also become a sort of neutral territory upon which all religions could meet on equal terms. The cosmopolitan character of this great commercial centre, in which Christians, Jews, and pagans of all countries competed for the acquisition of wealth, made it natural for all these different citizens to live in harmony and mutual toleration. The time came, however, when Christianity was proclaimed the official state religion under Theodosius the Great, upon whose instigation or order the Roman Senate (not by a unanimous, but by a simple majority vote) passed a resolution declaring that the Christian religion should be the only true religion for the Roman Empire. This official declaration became the signal for a brutal persecution of the old religion throughout the Empire, and especially in its eastern provinces. Very prominent in this work of persecution and destruction was Theophilus, Archbishop of Alexandria, who was famous far and wide as one of the great lights of the Church and as a man of exceptional piety, although many of his actions are utterly inexcusable from a moral point of view. Theophilus was in constant warfare with the pagans and Jews of Alexandria, who quite often joined hands in fighting him. But, as a rule, they were defeated by the pugnacious prelate, who, on such occasions, always found at his command a formidable army composed of the mob of the city and of the monks of the desert of Nitria, which was near the city. The main object of Theophilus’s attacks was the great Serapeum, in which immense treasures of gold, silver, and sacred vessels were stored away, and which contained also the great collection of books,--a perfect armory of pagan philosophy, religion, and poetry,--which was especially obnoxious to him. By shrewdly misrepresenting the spirit of revolt among the Jews and pagans of the city, he succeeded in getting an edict from the Emperor authorizing him to destroy this temple of ancient wisdom and culture,--and, for the second time, the magnificent library of Alexandria was partly destroyed, partly scattered to the winds.