Cadell was given the Kingdom of Seisyllwg by his father, Rhodri Mawr in the late 9th century. However, it is unclear how much independence he managed to assert after his father's death. His son, Hywel Dda (the Good) married the heiress of the King of Dyfed and united the two kingdoms to become the first King of Deheubarth.
Records of King Cadell date back to the 9th century. He is an historic personage
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