Glywys

A 5th century king of Wales. Ruler of the kingdom: Glywysing. 
Descended from a Roman Governor in the region, Glywys is the eldest son of Solor, son of Mor. King Glywys is married to Gwawl, the daughter of Ceredig of Ceredigion. They had twenty two children, all male bar one, including the churchmen Pedrog and Edelig. 
After the death of Glywys his kingdom was divided into three minor kingdoms, and what were eventually cantrefi: Gwynllwg, Penychen and Gorfynydd, by his sons Gwynllyw, Pawl and Merchwyn respectively, though Glwysing still existed and would later become Morgannwg.