'' found in the
Red Book of Hergest Rhys was unable to withstand the increasing Norman pressure. The Welsh
Bruts (chronicles) state that "Rhys ap Tewdwr, king of Deheubarth, was slain by the Frenchmen who were inhabiting Brycheiniog." The
Brut y Tywysogion adds "and with him fell the
kingdom of the Britons." This passage lends evidence to the belief that the conquest of Brycheiniog (
Brecon), led by
Bernard de Neufmarche, was mostly finished by Eastertide 1093.
The battle of Brecon opened the way to the conquest of Deheubarth. The monastery and village of
Penrhys in
Rhondda Cynon Taff is said to be named for Rhys, as he was beheaded at the site by Norman forces. The village was originally named,
Pen-Rhys ap Tewdwr (English: Rhys ap Tewdwr's Head). Upon Rhys's death, the Normans seized much of south Wales, and there was fighting over the spoils with the chieftains of Powys and Gwynedd. Eventually, Rhys's eldest son, Gruffydd, was allowed to inherit a small portion of his father's kingdom. Rhys's daughter
Nest was briefly one of the numerous concubines of Henry I, to whom she bore a son, and thereafter the wife of
Gerald FitzWalter of Pembroke; their sons and grandsons, the FitzGerald conquerors of Ireland, were known collectively as the "sons of Nest". Through his son Gruffydd, Rhys was an ancestor of the
Tudor dynasty. ==Ancestry==