Cadwallon

Cadwallon (or Cadwalader) (died 633 )
King of Gwynedd, north Wales. His hatred of the Anglo-Saxon kingdom of Northumbria intensified when his attempts at invasion ( 629 ) failed and he was forced to flee to Ireland. Although a Christian, he next allied with the heathen King Penda of Mercia. Their victory at Hatfield Chase ( 632 ) over Edwin of Northumbria was followed by the devastation of Northumbria. Thereafter Northumbrian fortunes recovered and Cadwallon was killed in battle by Edwin's nephew Oswald at Heavenfield, near Hexham.