Born in 642 in Northumbria of a noble English family, in 674 he was abbot of the Monastery of St. Peter at Wearmouth and later, from 682, also of the twin Monastery of St. Paul at Jarrow. Ceolfrith worked to bring the Irish and Scots to the observance of Roman doctrine, also writing to the king of the Picts Ep. ad Naitanum, in Bede, Hist. Eccl. V, 21: PL 95, 271-280 so that he would adhere to Roman Easter practice and preserve, with his people, the unity of the Catholic church. At Rome in 678 he found a large quantity of codices, among them a copy of the Vulgate, which he then had reproduced in England in three copies, two for the libraries of the monasteries under him and one, very probably made at Wearmouth or Jarrow under Bede’s oversight, to bring personally as a gift at the Confession of St. Peter. Died 716 at Langres as he was going to Rome with the third copy of the Vulgate Codex Amiatinus. CPL 1377; E.A. Lowe, English Uncial, Oxford 1960, Pl. VIII; B. Fischer, Lateinische Bibelhandschriften im frühen Mittelalter, Freiburg 1985, 9-21; K. Corsano, The First Quire of the Codex Amiatinus and the Institutiones of Cassiodorus: Scriptorium 41 1987 3-34; R. Marsden, The Survival of Ceolfrith’s Tobit in a Tenth-Century Insular Manuscript: JTS 45 1994 1-23; I. Wood, The Most Holy Abbot Ceolfrid, The Jarrow Lecture 1995 Newcastle-upon-Tyne 1996.