However, in 1143 Anarawd was treacherously killed by the men of Owain's brother Cadwaladr. Cadwaladr himself was strongly suspected of having ordered the killing. This greatly angered Owain, for Anarawd had been a key ally and was about to marry Owain's daughter. Owain sent his son Hywel ab Owain Gwynedd to strip Cadwaladr of his lands in Ceredigion in punishment.
Succession
Anarawd was followed on the throne of Deheubarth by his brother Cadell.