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Rhodri Mawr, king of Gwynedd, died in 878. Although he was an important Welsh king, it is not really appropriate to call him the "first King of Wales", for there were large parts of Wales over which he did not rule. Most sources give the name of Rhodri's wife as Angharad, heiress of Ceredigion, and give his mother as Nest, heiress of Powys, but Patrick Sims-Williams [in the article "Historical Need and Literary Narrative: a Caveat from Ninth-Century Wales", Welsh History Review, vol. 17 (1994), pp. 1-40] has recently argued (conclusively, in my opinion) that neither Nest nor Angharad ever existed, and that they were inventions of later genealogists who wanted to give Rhodri's family a line of descent from the earlier kings of Powys and Ceredigion.