Bede. Historia Ecclesiastica Gentis Anglorum (Ecclesiastical History of English People, or A History of the English Church and People). early Eighth Century AD (AD 731):

Sherley-Price, Leo tr. R E Latham rev. Bede: A History of the English Church and People.
Harmondsworth, Middlesex: Penguin Books Ltd, 1986 (May 1955). 978-0-1404-4042-3, 0-1404-4042-9.

Sellar, A M, tr. Bede’s Ecclesiastical History of England: A Revised Translation. London: George Bell and Sons, 1907.
   https://www.sacred-texts.com/chr/bede/index.htm
   https://ia802604.us.archive.org/10/items/bedesecclesiast00bedegoog/bedesecclesiast00bedegoog.pdf