800
- 829 Northumbria accepts Egbert of Wessex as overlord.
- 865 Northumbrians led by Aelle II defeat Ragnar Lodbrok's raiding Swedes.
- 866 York and southern Northumbria are conquered and settled by the "Great Heathen Army."
- 867 Aelle II and Osbeorht join forces only to be defeated at the Battle of York.
Read more about this topic: Timeline Of Northumbria And Northumberland