Egbert was king of the West Saxons in 802 and later the sole monarch of England and Bretwalda. He died in 839. The son of Ealhmund, a king of Kent, he was driven into exile to the court of Charlemagne and returned to England as king of the West Saxons in 802. he then subdued West Wales or Cornwall, defeated the king of Mercia at Ellandune, annexed Kent, and in 829 became overlord of all the English kings. He was defeated by Scandinavian pirates in 836, but in 838 routed a formidable army of Northmen and west Welsh at Hingston Down, in Cornwall. Research Egbert