Ecgfrith of Northumbria

King of Deira (664 to 670), King of Northumbria (670 to 685)

Ecgfrith was the King of Deira from 664 until 670, and then King of Northumbria from 670 until his death in 20 May 685 possibly at age of 31. He ruled over Northumbria when it was at the height of its power, but his reign ended with a disastrous defeat at the Battle of Nechtansmere against the Picts of Fortriu in which he lost his life.

This keyword could refer to multiple things. Here are some suggestions: