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In page Hywel Dda:

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Hywel's father Cadell had been installed as King of Seisyllwg by his father, Rhodri Mawr (Rhodri the Great) of Gwynedd, following the drowning of the last king in the traditional line, Gwgon, in 872. After Gwgon's death, Rhodri, husband to the dead king's sister Angharad, became steward of his kingdom.[citation needed] This gave Rhodri no standing to claim the kingship of Seisyllwg himself, but he was able to install his son Cadell as a subject king. Cadell died around 911, and his lands in Seisyllwg appear to have been divided between his two sons Hywel and Clydog.[1][3]