At the solicitation of Theophilus bishop of Alexandria the emperor issued an order at this time for the demolition of the heathen temples in that city; commanding also that it should be put in execution under the direction of Theophilus.
Seizing this opportunity, Theophilus exerted himself to the utmost to expose the pagan mysteries to contempt. And to begin with, he caused the Mithreum to be cleaned out, and exhibited to public view the tokens of its bloody mysteries. He also destroyed the Serapeum and had the phalloi of Dionysos, used in extravagant superstitions, brought forth and carried through the midst of the forum.
The Pagans of Alexandria, and especially the professors of philosophy, were unable to repress their rage at this exposure, and exceeded in revengeful ferocity their outrages on a former occasion: for with one accord, at a preconcerted signal, they rushed impetuously upon the Christians, and murdered every one they could lay hands on. The Christians also made an attempt to resist the assailants, and so the mischief was the more augmented.
This desperate affray was prolonged until satiety of bloodshed put an end to it. Then it was discovered that very few of the heathens had been killed, but a great number of Christians; while the number of wounded on each side was almost innumerable.
– Socrates Scholasticus, Ecclesiastical History 5.16