Glywys

He is said to have married Gwawl, the daughter of Ceredig of Ceredigion: one legend states they had twenty two children, all male bar one, including the churchmen Pedrog and Edelig.

According to twelfth century sources, after the death of Glywys the kingdom was divided into three cantrefi, Gwynllwg, Penychen and Gorfynydd, by his sons Gwynllyw father of Cadoc, Pawl and Merchwyn respectively, though Glwysing still existed and would later become Glamorgan.

Glywys' name may be a back-formation from the name of the kingdom[3] and Glywysing's name may continue that of the Romano-British *Glevenses, the territory and citizens of Glevum, or Gloucester.

"Gloucester" (Glowancestre, 1282) derives from the Old English ceaster, "fort", preceded by the Roman stem Glev- (pronounced glaiw).

[7] Nevertheless Glywys is believed to have become a hermit in his later life and travelled to Cornwall where he founded the church of St Gluvias near Penryn.