Rhodri King Dyfed was born to Hyfaidd Dyfed.
Around 893 [his brother] Llywarch ap Hyfaidd King Dyfed succeeded King Dyfed.
Around 904 Llywarch ap Hyfaidd King Dyfed was killed by Hywel "Dda aka Good" King Seisyllwg King Deheubarth [aged 24] and his father Cadell ap Rhodri King Seisyllwg [aged 50]. His brother Rhodri succeeded King Dyfed.
In 905 Rhodri King Dyfed was killed.