Rhodri (d. 878), king of Gwynedd, Powys, and Deheubarth (844-78), known as Rhodri Mawr (‘the Great’). The son of Merfyn Frych (‘the Freckled’), king of Gwynedd, and Nest of Powys, Rhodri assembled a dominion that inspired others to attempt the same. Rhodri acquired Gwynedd when his father died (844), Powys through his mother and uncle (855), and Seisyllwg (modern Carmarthenshire and Cardiganshire) after his wife's brother died.