Cynfyn ap Gwerstan
Cynfyn ap Gwerystan (Cynfyn son of Gwerstan or Gwerystan; born c. 990) was an obscure Welsh nobleman principally known on account of his son Bleddyn ap Cynfyn, who established the House of Mathrafal over Powys thanks to a Saxon invasion in 1063.
It was said that his father was Gwerstan ap Gwaithfoed and his mother Nest ferch Cadell. It is possible that his father was a Saxon, as the name "Gwerystan" appears to be a Welsh transcription of the Anglo-Saxon name Werestan. Cynfyn married Angharad, daughter of King Maredudd ab Owain of Dyfed.
- Hen Lwythau Gwynedd a'r Mars, a medieval manuscript containing pedigrees of the chief non-royal families of north Wales, edited by P.C. Bartrum in the National Library of Wales Journal, vol xii, part 3
- J. Morris - Shropshire Genealogies volume 1 page 86
- Genea Journey
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