Beornwulf

(from the article `United Kingdom`) ...became king there in 802, though there is no recorded warfare between the kingdoms for many years, during which Egbert conquered Cornwall and ...
Found on http://www.britannica.com/eb/a-z/b/50

Beornwulf

Beornwulf was king of Mercia in 821. He was killed by his own subjects.
Found on http://www.probertencyclopaedia.com/browse/CXB.HTM
No exact match found