When is the Kingdom of Northumbria shown on the map?

The border data draws the Kingdom of Northumbria AD 612–632, 634–935, in 2 separate periods. The source samples borders at fixed dates, so a span can begin late or run on past the end.

How large was the Kingdom of Northumbria?

At its greatest extent drawn on this map, the Kingdom of Northumbria covered about 86,000 km². That is the largest area the border data gives it across the years it is drawn, not necessarily its greatest extent in history.

Europe · The successor kingdoms

Kingdom of Northumbria

drawn on the map AD 612–632, 634–935

Northumbria ("the land north of the Humber") was formed from the union of Bernicia and Deira, first achieved by Æthelfrith c. 604 and made permanent in the 7th century. At its height it stretched from the Humber to the Forth and into south-west Scotland.

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Shown on the map: AD 612–632, 634–935 (2 periods)
Peak area: 86k km²
Region: Europe

Names and formation

Golden age and rulers

Edwin (616–633) accepted Christianity from the Roman missionary Paulinus (627) and held a wide overlordship before being killed by Penda and Cadwallon at Hatfield Chase (633). Oswald (634–642), raised in exile on Iona, restored the kingdom and Christianity (winning at Heavenfield, 634) before falling to Penda. Oswiu (642–670) killed Penda at the Winwæd (655) and, crucially, convened the Synod of Whitby (664), deciding that Northumbria would follow Roman rather than Ionan (Irish) practice on the dating of Easter and the tonsure — a landmark, though modern scholars (e.g. Clare Stancliffe) debate how far it represents a decisive "Romanisation." The later 7th and early 8th centuries were the Northumbrian "golden age": Bede at Wearmouth-Jarrow, the Lindisfarne Gospels, St Cuthbert, Wilfrid, Benedict Biscop and a flowering of art and learning.

Decline

The military zenith passed with the catastrophic defeat and death of Ecgfrith at the hands of the Picts at Nechtansmere (Dun Nechtain, 685), which ended Northumbrian expansion northward. The 8th century saw dynastic instability. In 867 the Great Heathen Army captured York, which became the Viking kingdom of Jórvík. The northern part survived as an Anglo-Scandinavian and then English earldom; the region was fought over by the emerging kingdoms of England and Scotland into the 11th century.

Source note

Northumbria is exceptionally well documented for the early period because of Bede, whose Ecclesiastical History (731) is both the foundational source and an interpretive lens whose ecclesiastical priorities shape the record.

Common questions

What was the Kingdom of Northumbria?: Northumbria ("the land north of the Humber") was formed from the union of Bernicia and Deira, first achieved by Æthelfrith c. 604 and made permanent in the 7th century. At its height it stretched from the Humber to the Forth and into south-west Scotland.
When is the Kingdom of Northumbria shown on the map?: The border data draws the Kingdom of Northumbria AD 612–632, 634–935, in 2 separate periods. The source samples borders at fixed dates, so a span can begin late or run on past the end.
How large was the Kingdom of Northumbria?: At its greatest extent drawn on this map, the Kingdom of Northumbria covered about 86,000 km². That is the largest area the border data gives it across the years it is drawn, not necessarily its greatest extent in history.
How did the Kingdom of Northumbria end?: The military zenith passed with the catastrophic defeat and death of Ecgfrith at the hands of the Picts at Nechtansmere (Dun Nechtain, 685), which ended Northumbrian expansion northward. The 8th century saw dynastic instability.

Sources

This compendium cites its sources once for the whole document rather than per territory. Its bibliography names the English Wikipedia articles for each kingdom as the primary basis, with Encyclopædia Britannica, the World History Encyclopedia, national heritage bodies (Historic Environment Wales and Scotland, the Clwyd-Powys Archaeological Trust), museum sources and the Dictionary of Irish Biography, read against the Anglo-Saxon Chronicle, Bede and the Irish annals with their own biases. The article this entry is anchored on:

Wikipedia — Northumbria en.wikipedia.org/wiki/Northumbria

This entry was last updated 27 September 2026.

This entry was researched and drafted with AI from the sources above, and has not been reviewed by a historian. How entries are made

Text available under CC BY-SA 4.0: reuse it with a credit to The World Through Time and a link to this page. Passages drawing on the Wikipedia articles listed above are also licensed CC BY-SA 4.0 by their contributors.

Border geometry for the map itself comes from Cliopatria v0.12 (Seshat Global History Databank, CC-BY-4.0).

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