King Northumbria is in Northumbria.
In 617 Raedwald King East Anglia (age 47) and his son Raegenhere Wuffingas fought the Battle of the River Idle which took place at the River Idle Markham Moor Retford which forms the western border of the Isle of Lindsey [Map].
Raegenhere Wuffingas was killed.
On 15 Feb 670 King Oswiu of Northumbria (age 58) died. In 670 His son King Ecgfrith of Northumbria (age 25) succeeded King Northumbria. Æthelthryth Wuffingas Queen Consort Deira and Northumbria (age 34) by marriage Queen Consort Northumbria.
On 05 Aug 759 Æthelwald Moll King of Northumbria was crowned King Northumbria.
In 774 Æthelred I of Northumbria (age 12) was appointed King Northumbria.