The Oxford Biblical Studies Online and Oxford Islamic Studies Online have retired. Content you previously purchased on Oxford Biblical Studies Online or Oxford Islamic Studies Online has now moved to Oxford Reference, Oxford Handbooks Online, Oxford Scholarship Online, or What Everyone Needs to Know®. For information on how to continue to view articles visit the subscriber services page.

Related Content

Related Overviews

Penda (d. 655) king of the Mercians

Cadwaladr (d. 664) king of Gwynedd

St Oswald (c. 605—642) king of Northumbria


See all related overviews in Oxford Reference »


'Cadwallon' can also refer to...


More Like This

Show all results sharing these subjects:

  • History
  • Regional and National History


Show Summary Details



(d. 634) king of Gwynedd

Quick Reference

Son of Cadfan, succeeded c.625. Geoffrey of Monmouth related that he was brought up with Edwin of Northumbria, then a child refugee, but after Edwin had recovered his kingdom, they fell out. In 631 Edwin headed an invasion of north Wales, which captured Anglesey and drove Cadwallon over to Ireland. He returned in 633 and, with the aid of Penda of Mercia, overran Northumbria and killed Edwin at Heathfield; he followed this by slaying both Osric of Deira and Eanfrith of Bernicia. In 634 he was himself killed at Heavenfield, near Hexham, by Oswald of Northumbria. To the Welsh, the death of Cadwallon wrecked any lingering hope of driving the Saxons into the sea; to Bede and the Saxons, he was ‘the abominable leader of the Britons’.

Reference entries