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Bernicia and Deira were first united by Aethelfrith, a king of Bernicia who conquered Deira around the year 604. He was defeated and killed around the year 616 in battle at the River Idle by Raedwald of East Anglia, who installed Edwin, the son of Aellalla Ella Ille (d. 588), is the first known king of Deira. One of his sons was Edwin of Northumbria. According to the Anglo-Saxon Chronicle he became king the same year as Ceawlin of Wessex ( 560) on the death of Ida, and ruled 30 years. However, the Chron, a former king of Deira, as king. Edwin, who accepted ChristianityChristian cross and its many variations are widely recognized as an ancient Christian symbol. Christianity is an Abrahamic religion based on the life and teachings of Jesus of Nazareth as described in the New Testament. Although Christians generally chara in 627Events April 11 Paulinus, a Roman missionary, baptizes King Edwin of Deira December 12 Battle of Nineveh: Byzantine Emperor Heraclius defeats the Persians Births Deaths November 10 Justus, Archbishop of Canterbury 627., soon grew to become the most powerful king in England: he was recognized as BretwaldaThe title of Bretwalda was one perhaps used by some of the kings of the kingdoms of England (the so-called Anglo-Saxon heptarchy) in the second half of the first millennium AD. Such a king was considered to be the overlord of several Anglo-Saxon kingdoms. and conquered the Isle of ManThe Isle of Man Ellan Vannin in Manx), a British crown dependency, lies in the Irish Sea almost equidistant from England, Ireland, Scotland and Wales. With an area of 572 kmē (221 square miles) and a population of around 76,315 (2001 Census) it arguably h and GwyneddThis article is about the medieval kingdom of Gwynedd. For the modern administrative county of Wales, see Gwynedd. Gwynedd was one of the kingdoms or principalities of medieval Wales. Covering an area in the north-west of the country around Snowdonia and in northern WalesFor alternate meanings, see Wales (disambiguation Wales ( Welsh: Cymru pronounced /"k@mrI/ SAMPA, km IPA, 'Kumree' approximate pronunciation) is one of the four nations comprising the United Kingdom (the other three being England, Scotland and Northern Ir. He was, however, himself defeated by an alliance of the exiled king of Gwynedd, Cadwallon ap Cadfan and Penda, king of Mercia, at the Battle of Hatfield Chase in 633.
After Edwin's death, Northumbria was split between Bernicia, where Eanfrith, a son of Aethelfrith, took power, and Deira, where a cousin of Edwin, Osric, became king. Both of these rulers were killed during the year that followed, as Cadwallon continued his devastating invasion of Northumbria. After the murder of Eanfrith, his brother, Oswald, backed by a force of Scots sent by Domnal of Dalriada, defeated and killed Cadwallon at the Battle of Heavenfield in 634.