Saint Edwin 584 633 was the King of Northumbria from about 616 until his death. He converted to Christianity and was baptised in 627; after he fell at the Battle of Hatfield Chase, he was regarded as a saint and martyr. He was the son of Aella of Deira and the brother of Aethelric of Deira. Around the year 604, upon the seizure of Deira by his brother-in-law, Æthelfrith of Bernicia, Edwin was expelled and took refuge with the king of Gwynedd, Cadfan ap Iago. After the battle of Chester, in which Æthelfrith defeated the Welsh, Edwin fled to Raedwald, king of East Anglia. Aethelfrith offered Raedwald a bribe to kill Edwin, but Raedwald refused and defeated Ælthelfrith at the river Idle in 616 or 617 Aethelfrith was killed, and Raedwald installed Edwin as king of Northumbria. The sons of Æthelfrith, among them Eanfrith, were driven out Edwin is said to have founded the city of Edinburgh in 626, and it is possible that the city was named after him (one interpretation of its etymology is "Edwin's fort"). He also seems to have annexed Lindsey to his kingdom by 625. In this year he entered negotiations with Eadbald of Kent to marry his sister Æthelberga. It was a condition that Christianity should be tolerated in Northumbria, and accordingly Paulinus was consecrated bishop by Justus in 625, and was sent to Northumbria with Æthelberga. According to Bede, Edwin was favourably disposed towards Christianity owing to a vision he had seen at the court of Raedwald, and in 626 he allowed Eanfled, his daughter by Æthelberga, to be baptized. On April 20, the day his daughter was born, an attempt was made on the king's life by Eomer, an emissary of Cwichelm, king of Wessex. Saved by his devoted thegn and best friend Lilla who interposed his body to receive the fatal dagger blow, Edwin vowed to become a Christian if victorious over his treacherous enemy. He was successful in the ensuing campaign, and gave up worshipping his traditional gods. A letter of Pope Boniface V helped him decide, and, after consulting his friends and counsellors (one of whom, the priest Coifi, afterwards took a prominent part in destroying the temple at Goodmanham), he was baptized with his people and nobles at York, on Easter (April 12), 627. In this town he granted Paulinus of York a see, built a wooden church and began one of stone. Besides York, Yeavering and Maelmin in Bernicia, and Catterick in Deira, were the chief scenes of the work of Paulinus. It was the influence of Edwin which led to the conversion of Eorpwald of East Anglia. Bede notices the peaceful state of Britain at this time, and says that Edwin used a standard like that carried by the Roman emperors. Bede tells us that Edwin conquered the Isle of Man and took Anglesey from Cadwallon ap Cadfan, who, according to the Annales Cambriae, Edwin besieged on the island of Glannauc or Puffin Island. He was definitely recognized as overlord by all the other Anglo-Saxon kings of his day except Eadbald of Kent, and thus considered Bretwalda. The defeated Cadwallon fled into exile, but he returned within a few years and reconquered his lost lands with the aid of Penda of Mercia. Their combined armies then invaded Northumbria and defeated Edwin at Hatfield Chase near Doncaster, killing him along with his son Osfrith. Another of his sons, Eadfrith, was later executed by Penda. Edwin's body was hidden in the church of Edwinstowe.