List of monarchs of Northumbria in the context of Oswiu

Edwin (Old English: Ēadwine; c. 586 – 12 October 632/633), also known as Eadwine or Æduinus, was the King of Deira and Bernicia – which later became known as Northumbria – from around 616 until his death. He was the second monarch to rule both of these northern English kingdoms and the first to convert to Christianity. After he died in battle, he was venerated as a saint.

Edwin was the son of Ælle, the first known king of Deira, and likely had at least two siblings. His sister Acha was married to Æthelfrith, king of neighbouring Bernicia. Edwin was forced into exile when Æthelfrith conquered Deira. His travels took him to the court of Rædwald of East Anglia, who defeated Æthelfrith in 616, allowing Edwin to ascend the thrones of Bernicia and Deira. After the death of his patron Rædwald around 624, Edwin became the most powerful ruler in Britain. Bede the Venerable includes him in his list of kings who exercised imperium over other Anglo-Saxon monarchs, and the Anglo-Saxon Chronicle gives him the title bretwalda, or "ruler of Britain".

Eric Haraldsson (Old Norse: Eiríkr Haraldsson [ˈɛiˌriːkz̠ ˈhɑrˌɑldsˌson], Norwegian: Eirik Haraldsson; fl. c.930−954), nicknamed Bloodaxe (Old Norse: blóðøx [ˈbloːðˌøks], Norwegian: Blodøks) and Brother-Slayer (Latin: fratrum interfector), was a Norwegian king. He ruled as King of Norway from 932 to 934, and twice as King of Northumbria: from 947 to 948, and again from 952 to 954.

Bretwalda is an Old English word meaning 'ruler of Britain'. It is only recorded in the late 9th-century Anglo-Saxon Chronicle entry for the year 829. It is given to some of the rulers of Anglo-Saxon kingdoms from the 5th century onwards who had achieved overlordship of some or all of the other Anglo-Saxon kingdoms.

The rulers of Mercia were generally the most powerful of the Anglo-Saxon kings from the mid 7th century to the early 9th century but are not accorded the title of bretwalda by the Chronicle, which had an anti-Mercian bias. The Annals of Wales continued to recognise the kings of Northumbria as "Kings of the Saxons" until the death of Osred I of Northumbria in 716.

Oswald (Old English pronunciation: [ˈoːzwɑɫd]; c 604 – 5 August 641/642) was King of Northumbria from 634 until his death, and is venerated as a saint, of whom there was a particular cult in the Middle Ages.

Oswald was the son of Æthelfrith of Bernicia and Acha of Deira and came to rule after spending a period in exile. After defeating the Welsh Gwyneddian ruler, Cadwallon ap Cadfan, at the Battle of Heavenfield, Oswald brought the two Northumbrian kingdoms of Bernicia and Deira once again under a single ruler and promoted the spread of Christianity in Northumbria. He was given a strongly positive assessment by the historian Bede, writing a little less than a century after Oswald's death, who regarded Oswald as a saintly king; it is also Bede who is the main source for present-day historical knowledge of Oswald. After eight years of rule, in which he was the most powerful ruler in Britain, Oswald was killed in the Battle of Maserfield while fighting the forces of Penda of Mercia, who then himself was defeated by Oswald's brother Oswiu.

Eiríksmál is a skaldic poem composed c. 954 at the behest of the Norwegian queen Gunnhild in honour of her slain consort Erik Bloodaxe. Only the beginning of the poem is extant.

According to Roger of Wendover, Eric, a Viking ruler was betrayed and killed on Stainmore in 954 AD, while on the run and after being expelled from York. Eric had previously been King of Northumbria (c. 947–948 and 952–954) during his more successful days.

Æthelfrith (died c. 616) was King of Bernicia from c. 593 until his death around 616 AD at the Battle of the River Idle. He became the first Bernician king to also rule the neighboring land of Deira, giving him an important place in the development and the unification of the later kingdom of Northumbria. Reigning from the late 6th century until his death, he was known for his military campaigns against the Britons and his victory over the Gaels of Dál Riata. His most famous victory came at the Battle of Chester, where he decisively defeated a coalition of British forces, significantly weakening the influence of the native Britons in northern England. Æthelfrith's rule marked a turning point in the consolidation of Northumbria as a dominant force in early medieval Britain. He was killed in battle against a coalition led by Rædwald of East Anglia, who placed Edwin, the exiled heir of Deira, on the throne. His line was eventually restored to power in the 630s.