king of Northumbria (670–85). During the reign of Ecgfrith Northumbria reached the peak of its power. He extended the range of lordship of his father Oswiu, even sending a strong military expedition to Ireland. In his attempts to stabilize his northern frontier he subdued the British kingdom of Strathclyde, but he overreached himself on campaign against the Picts and was killed at Nechtansmere in 685.
Subjects: British History.