1. Nennius. 1980.British History and Welsh AnnalsEdited by: Morris, J. 1922London
2. Geoffrey of Monmouth. 1929.Historia Regum BritanniaeEdited by: Griscom, A. and Jones, R.E. 249–53. London
3. Curley, M. 1994.Geoffrey of Monmouth14–18. New York
4. Bede. 1991.Ecclesiastical History,, 2nd ed. Edited by: Colgrave, B. and Mynors, R.A.B. 300–301. Oxford
5. Aelfric. 1881.Lives of SaintsEdited by: Skeat, W.W. 290–91. London