Cadell ap Rhodri

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

Life
Cadell was the second son of King 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.

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.

Cadell had two other sons, Morgan and Cadwgan.