CYNEWULF (d. 785), king of Wessex, succeeded to the throne in 757 on the deposition of Sigeberht. 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, with all his thegns present, at Marten, Wilts (Merantune), by Cyneheard, brother of the deposed Sigeberht.
See Earle and Plummer's edition of the Anglo-Saxon Chronicle. 755, 779 (Oxford, 1892).