Cadell ap Rhodri
| Cadell ap Rhodri | |
|---|---|
| King of Seisyllwg | |
| Reign | 872 – 909 AD |
| Predecessor | Rhodri Mawr |
| Successor | Hywel Dda |
| Born | c.850 |
| Died | 909 AD |
| Issue | Hywel Dda Morgan Cadwgan |
| House | House of Dinefwr |
| Father | Rhodri Mawr |
| Mother | Angharad |
Cadell ap Rhodri (854–909) was King of Seisyllwg, a minor kingdom in southwestern Wales, from about 872 until his death. The son of Rhodri Mawr, King of Gwynedd, Cadell was in turn the father of Hywel Dda, who eventually came to rule most of Wales and caused Welsh laws to be codified. Cadell is considered the founder of the Welsh royal House of Dinefwr.