Coba jelasin Catatan dari Pertempuran Chester dong

Beda, Historia Ecclesiastica Gentis Anglorum, ed. and tr. Colgrave, Bertram; Mynors, Roger AB (1969). Bede's Ecclesiastical History of the English People. Oxford Medieval Texts. Oxford: Clarendon Press. ISBN 0-19-822202-5.  See also

Tawarikh Tigernach, ed. & partial trans. by Whitley Stokes (1895–1897). "The Annals of Tigernach". Études Celtiques. 16–18. (= Vol. 16 (1895), p. 374-419; 17 (1896), p. 6-33, 116-263, 337-420; 18 (1897), p. 9-59, 150-197, 267-303, 390-391). Edition available from CELT

Trioedd Ynys Prydein, ed. and tr.

Reginald dari Durham, Life of St. Oswald (c. 1150)

Brut y Brenhinedd (MS Cotton Cleopatra), ed.

Geoffrey dari Monmouth, Historia Regum Britanniae (1136)