Rhodri ap Hyfaidd

Rhodri ap Hyfaidd (?-905) was briefly the king of Dyfed. After his brother Llywarch was killed by Hywel Dda and his father Cadell, Rhodri reigned briefly before he himself was killed and the throne was usurped by Hywel, under whom the kingdom then merged with Seisyllwg to form Deheubarth).

...
Wikipedia