Pamphilus, a presbyter of Cæsarea, was Eusebius’ teacher and most intimate friend, and after his death Eusebius showed his affection and respect for him by adopting his name, styling himself Eusebius Pamphili. He pursued his studies in Alexandria (according to Photius, under Pierius, more probably under Achillas, the head of the catechetical school there; see below, notes 42 and 53), and conceived an unbounded admiration for Origen, the great light of that school, which he never lost. Pamphilus is chiefly celebrated for the library which he collected at Cæsarea and to which Eusebius owes a large part of the materials of his history. Jerome also made extensive use of it. It was especially rich in copies of the Scripture, of commentaries upon it, and of Origen’s works (see above, p. 38). He wrote very little, devoting himself chiefly to the study of Scripture, and to the transcription of mss. of it and of the works of Origen. During the last two years of his life, however, while in prison, he wrote with the assistance of Eusebius a Defense of Origen in five books, to which Eusebius afterward added a sixth (see above, p. 36 sq.). During the persecution under Maximinus, he was thrown into prison by Urbanus, prefect of Cæsarea, in 307, and after remaining two years in close confinement, cheered by the companionship of Eusebius, he was put to death by Firmilian, the successor of Urbanus, in 309, as recorded below, in the Martyrs of Palestine, chap. 11 (see above, p. 9). The Life of Pamphilus which Eusebius wrote is no longer extant (see above, p. 28). On Pamphilus, see Jerome, de vir. ill. chap. 75, and Photius, Cod. 118. See also the present volume, p. 5–9 passim.