CYNEWULF (d. 785), king of Wessex, succeeded to the throne in 757 on the deposition of Sigebert. He was constantly at war with the Welsh. In 779 Offa of Mercia defeated him and took Bensington. In 785 he was surprised and killed at Marten, Wilts (Merantune), by Cyneheard, brother of Sigebert.
See J. Earle and C. Plummer's edition of the Anglo-Saxon Chronicle, 755, 779 (Oxford, 1892).