An early medieval northern kingdom that became central to both Anglo-Saxon history and Viking legend.
Northumbria — the union of Bernicia and Deira north of the Humber — was seventh-century Britain's superpower and Europe's unlikely lighthouse: the kingdom of Oswald and the Whitby synod, of Lindisfarne, Bede, and the Codex Amiatinus, whose "golden age" made a windswept frontier the most learned corner of the Latin West.
Its later history was a long dismemberment: the first Viking raid in recorded western memory at Lindisfarne (793), the Great Army taking York (866–867) and planting the Danish kingdom of Jórvík, Æthelstan's annexation (927), and the earldom's absorption — harried by the Conqueror, contested by Scotland — into medieval England's far north.
Two Anglian kingdoms seeded it: Bernicia on its rock-fortress of Bamburgh and Deira around York, united (and repeatedly re-divided) by warrior-kings from Æthelfrith onward. Edwin's baptism at York (627) with Paulinus began royal Christianity; his fall to Penda and Cadwallon led to Oswald's restoration from Iona's exile — victory at Heavenfield (634), Aidan summoned to found Lindisfarne — and Oswiu's long supremacy, which at the Synod of Whitby (664) chose Roman over Irish usage for the English church.
The northern imperium broke at the Trent (679) against Mercia and at Nechtansmere (685), where the Picts destroyed Ecgfrith and the kingdom's Scottish ambitions together; thereafter Northumbria's greatness was cultural. Its eighth-century politics decayed into coup and counter-coup — eleven kings deposed or murdered in a century — even as its cloisters flowered.
The generation around 700 produced wonders from twin sources: Irish-rooted Lindisfarne, whose Gospels (c. 715) fused Celtic, Germanic, and Mediterranean art into the insular style's masterpiece; and Roman-facing Wearmouth-Jarrow, Benedict Biscop's twin foundation, whose library fed Bede — the age's greatest scholar, whose Ecclesiastical History (731) invented English history — and whose scriptorium produced the Codex Amiatinus, the oldest complete Latin Bible in existence.
York's school carried the flame forward: its master Alcuin, headhunted by Charlemagne in 781, became the Carolingian renaissance's schoolmaster — Northumbrian learning refounding continental education. Stone crosses (Ruthwell, Bewcastle), Cædmon's first English religious verse at Whitby, and Cuthbert's cult at Lindisfarne completed a culture without contemporary equal north of Rome.
Lindisfarne's sack in June 793 — "never before has such terror appeared in Britain", Alcuin wrote from Charlemagne's court — opened the Viking age; the Great Heathen Army closed the kingdom, taking York in 866–867 and killing both rival kings who stormed its walls. Danish Jórvík ruled from the Ouse for nearly a century — a trading boomtown under kings like Guthfrith and the Dublin dynasty — while English earls held out beyond the Tees at Bamburgh, and Cuthbert's monks wandered seven years with his coffin to eventual rest at Durham (995).
The end came in instalments: Æthelstan took York in 927; the last Viking king, Eric Bloodaxe, was expelled and killed at Stainmore in 954; and the earldom of Northumbria passed through English, Danish, and Norman hands — Siward, Tostig Godwinson (whose misrule sparked the 1065 revolt), Morcar — until William the Conqueror's Harrying of the North (1069–1070) answered rebellion with a devastation Domesday still records as "waste". Durham's palatine bishops and the border earls inherited the fragments; the Scots took Lothian for good after Carham (1018), fixing the future Anglo-Scottish line on the Tweed.
Northumbrian kingship was war-band kingship writ large: Bernician and Deiran royal lines alternating and feuding, sub-kings under overlord-kings (Bede's imperium), tribute from Picts, Britons, and Mercians when strong, and — uniquely well-documented — the eighth century's revolving-door depositions, which Alcuin's letters diagnose as the kingdom's moral disease.
The church was co-government: bishop-abbots of royal kin, monasteries as royal treasuries and archives, Cuthbert's community at Durham eventually holding a palatinate no other English see matched. After 954 "Northumbria" meant an earldom whose holders — from Bamburgh's house through Siward to the Conquest — governed a border society of liberties (Durham, Tynedale, Redesdale) that kept the region constitutionally peculiar throughout the Middle Ages.
Æthelfrith, c. 592–616 — the unifier-conqueror the Britons called "the Twister".
Edwin, 616–633 — first Christian king; York's baptism, 627.
Oswald, 634–642 — Heavenfield's victor, Lindisfarne's founder, the warrior-saint.
Oswiu, 642–670 — Penda's slayer at the Winwaed (655); Whitby's arbiter (664).
Ecgfrith, 670–685 — the overreach: Trent and Nechtansmere ended the imperium.
Eric Bloodaxe, York's last king, d. 954 — the Viking kingdom's violent coda.