Cadwgan ab Owain (died 951) was a joint king of Glywysing in Wales of the High Middle Ages along with his brother Gruffydd.[1] His other brother Morgan ruled in Gwent.
His murder "by the Saxons" was recorded in the Annals of Wales. Phillimore's reconstruction of the dates places the entry in AD 951.[2] Afterwards, the kingdoms of Gwent and Glywysing were united under his brother Morgan as Morgannwg.