St. Glywys Cernyw, King of Glywysing
Glywys was the eldest son of King Solor. (For details of the family of the younger son see the Gorlois of Tintagel.) In the mid-5th century, he became the first King in mid South Wales to really leave his mark on the area: so much so that his Kingdom of Cernyw was renamed Glywysing after him. It has been suggested that his name is the original of the Arthurian Literary character, Sir Cligés, who exiled himself to the court of King Arthur when he fell in love with his uncle's new wife. In his twilight years, Glywys became a hermit at Merthyr Glywys (Clivis, Glamorgan). Perhaps he had been converted to Christianity by his grandson. As as holyman, he is mentioned on an inscription at Ogmore and his memorial stone can be seen at Merthyr Mawr. Legend gave Glywys a vast family of twenty sons and one daughter. Following British tradition, Glywysing was divided, probably before his death, between his sons, though possibly only between the four or five known historical ones. The others appear to be back-formations from the names of modern South Welsh cantrefs.