Glywys is a legendary early 5th century Wales king, an important character in early Welsh genealogies as the eponymous founder king of Glywysing, The Welsh Academy Encyclopaedia of Wales. John Davies, Nigel Jenkins, Menna Baines and Peredur Lynch (2008) pg323 a southeast Welsh kingdom whose heartland lay between the River Tawe and the River Usk.
In one genealogy Glywys is reckoned the eldest son of Solor, son of Mor. He is said to have married Gwawl, the daughter of Ceredig: 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. Gwynllyw gave his name to Newport Cathedral and also to Wentlooge.
Glywys' name may be a back-formation from the name of the kingdomCarver, Martin The cross goes north: processes of conversion in northern Europe, AD 300-1300 Boydell Press; New edition (26 Jan 2006) p.125 and Glywysing's name may continue that of the Romano-British *Glevenses, the territory and citizens of Glevum, or Gloucester.Koch, John T., ed. Celtic Culture: a historical encyclopedia. Santa Barbara: ABC-Clio Ltd (15 Mar 2006) p. 1312 Such invented founding kings are not uncommon in British genealogy. "Gloucester" ( Glowancestre, 1282) derives from the Old English ceaster, "fort", preceded by the Roman stem Glev- (pronounced glaiw).Kenneth Cameron: English Place Names In Old Welsh, the city was known as Caerloyw, caer = castle, and loyw from gloyw = glowing/bright. Hence Gloucester has been given a similar founder, Gloyw: genealogies of Vortigern make him a descendant of Gloyw through his father Vitalus and his grandfather Vitalinus,Genealogies online at Vortigern Studies website http://www.vortigernstudies.org.uk/artfam/genwaleseast.htm while a lineage in the Bonedd y Saint makes saint Mechyll fab Echwys the grandson of Gwyn Glohoyw and the great-grandson of Gloyw Wallt-Lydan. In the Mabinogi, similarly, Pryderi marries Cigfa, "daughter of Gwyn Glohoyw, son of Gloyw Wallt-Lydan, son of Casnar Wledig".Hughes, Ian. Manawydan uab Llyr
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. He is sometimes referred to as the Cornish Glywys, Glywys Cernyw.
He is venerated as a saint and his feast day is 3 May
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