Eusebius of Caesarea (; , Eusébios;  260/265 – 339/340), also known as Eusebius Pamphili, was a Roman historian, exegete, and Christian polemicist of Greek descent. He became the bishop of Caesarea Maritima about 314. Together with Pamphilus, he was a scholar of the Biblical canon and is regarded as an extremely well learned Christian of his time. He wrote Demonstrations of the Gospel, Preparations for the Gospel, and On Discrepancies between the Gospels, studies of the Biblical text. As "Father of Church History" he produced the Ecclesiastical History, On the Life of Pamphilus, the Chronicle and On the Martyrs.