Cadell ap Rhodri

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King of Seisyllwg
Reign872 – 909 AD
PredecessorRhodri Mawr
SuccessorHywel Dda
Died909 AD
IssueHywel Dda
HouseHouse of Dinefwr
FatherRhodri Mawr

Cadell ap Rhodri (854–909) was King of Seisyllwg, a minor kingdom in southwestern Wales, from about 872 until his death.


Cadell was the second son of Rhodri the Great of Gwynedd and Angharad, a princess from Seisyllwg. In 872 Angharad's brother Gwgon, King of Seisyllwg, drowned without leaving an heir. Rhodri became steward over the kingdom, and while he was unable to make a legal claim to the throne, he was able to install Cadell as king.[1]

He passed it to his son, Hywel Dda, at his death in 909. Cadell and Hywel together also conquered Dyfed in 904–905, establishing Hywel as the king in that region. After his father's death, Hywel ruled the kingdoms jointly as Deheubarth.

See also[edit]


  1. ^ Lloyd, John Edward (1912). A History of Wales from the Earliest Times to the Edwardian Conquest. Longmans, Green, and Co. p. 325. Retrieved July 7, 2010.


Cadell ap Rhodri
Dinefwr Dynasty
Born: 854 Died: 909
Preceded by
Rhodri the Great
Prince of Seisyllwg
Merged by Hywel Dda into Deheubarth