Bede, III: VI (Oswald "brought under his dominion all the nations and provinces of Britain, which are divided into four languages, viz. the Britons, the Picts, the Scots, and the English." Bede, Ecclesiastical History of England III, consultado el 8 de mayo de 2011., , recuperado 8,
Bede, III: XXIV Oswiu "subdued the greater part of the Picts to the dominion of the English" in 658. Bede, Ecclesiastical History of England III, consultado el 8 de mayo de 2011., , recuperado 8,