Hywel ap Rhys (Glywysing)
Hywel ap Rhys ('Hywel son of Rhys') (ruled c. 840–886) was a king of Glywysing (either in part or in its entirety) in South Wales.
His sons Arthfael and Owain were probably responsible for the reünification of the realm of Morgannwg. His grandsons, Owain's sons, Gruffydd ab Owain (died c. 935 at the hands of troops from Ceredigion) and Cadwgan ab Owain (died c. 949 0r 951, "murdered by the Saxons") ruled as joint kings of Glywysing from c. 930 until their deaths, before the surviving brother Morgan Hen ab Owain (d. 974), having previously ruled as King of Gwent, brought the territories together under him as the Kingdom of Morgannwg.