What Brittonic dialect was spoken in the kingdom who had the father of Owain mab Urien as king?
Rheged Rheged (] ) was one of the kingdoms of the "Hen Ogledd" ("Old North"), the Brittonic-speaking region of what is now Northern England and southern Scotland, during the post-Roman era and Early Middle Ages. It is recorded in several poetic and bardic sources, although its borders are not described in any of them. Some modern scholars have suggested that it included what is now Cumbria in North West England and possibly extended into Lancashire and Scotland. In some sources, Rheged is intimately associated with the king Urien Rheged and his family. Its inhabitants spoke Cumbric, a Brittonic dialect closely related to Old Welsh.
Cinuit of Alt Clut Cinuit (Welsh: "Cynwyd" ) may have been an early ruler of the Brittonic kingdom of Alt Clut, later known as Strathclyde, in Britain's "Hen Ogledd" or "Old North". The Harleian genealogies indicate that he was the son of Ceretic Guletic, who may be identified with the warlord "Ceredig" rebuked by Saint Patrick in one of his letters. According to the same pedigrees, he was the father of Dumnagual Hen, an important but obscure ancestor figure in Welsh tradition. The later genealogy "Bonedd Gwŷr y Gogledd" replaces Cinuit as Dumnagual's father with a certain Idnyuet, said to be the son of Maxen Wledic (the Roman usurper Magnus Maximus). However, the "Bonedd" does include a "Cynwyd Cynwydion" in the ancestry of Clydno Eiddyn, and a Triad attached to the text mentions the "three hundred swords of the (tribe of) Cynwydion" as one of three formidable north British war bands, along with those of Coel Hen and Cynfarch.