NPNF2-01. Eusebius Pamphilius: Church History, Life of Constantine, Oration in Praise of Constantine

Chapter XXVI.—Heraclas becomes Bishop of Alexandria.

It was in the tenth year of the above-mentioned reign that Origen removed from Alexandria to Cæsarea,¹⁹⁹⁶ leaving the charge of the catechetical school in that city to Heraclas. Not long afterward Demetrius, bishop of the church of Alexandria, died, having held the office for forty-three full years,¹⁹⁹⁷ and Heraclas succeeded him. At this time Firmilianus,¹⁹⁹⁸ bishop of Cæsarea in Cappadocia, was conspicuous.