| Notes | 
The first half of the seventh century saw a struggle between theAnglo-Saxon kingdom of Northumbria and Gwynedd for the mastery of the
 former province of Britain. Cadwallon of Gwynedd allied himself with
 Penda, the pagan Anglo-Saxon king of Mercia, against Edwin of
 Northumbria. In 633 the allies defeated and killed Edwin and Cadwallon
 became the dominant ruler north of the Trent but he was killed a year
 later near Hadrians Wall. The struggle continued for some time but
 Northumbria emerged victorious and Gwynedds bid for supremacy came to
 an end.
 
 In the eighth century Mercia, the former ally emerged as the new
 threat and became the leading Anglo-Saxon power. Several Mercian
 attacks on Gwynedd followed. At the end of the century, Offa of Mercia
 built the dyke which bears his name and this marked the final boundary
 between Wales and England. Mercian attacks continued however and in
 822 Deganwy, Maelgwn Gwynedds former stronghold was destroyed.
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