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- Rhiwallon ap Cynfyn (c. 1020-1069) was a Welsh prince, the son of Cynfyn ap Gwerstan. On the downfall of Gruffydd ap Llywelyn in 1063 he received (with his brother Bleddyn ap Cynfyn) North Wales on condition of faithfully serving Edward the Confessor ‘everywhere by water and by land.’ As the son of Angharad, daughter of Maredudd ab Owain ap Hywel Dda, he was Gruffydd's half-brother. In August 1067 he and Bleddyn joined Eadric the Wild in an attack upon Herefordshire, which was part of the general resistance to the Conqueror. In 1069 or 1070 the two fought the battle of Battle of Mechain with Maredudd and Idwal, sons of Gruffydd ap Llywelyn. Though they were victorious, Rhiwallon fell, leaving Bleddyn sole prince of North Wales. His daughter Gwladys married Rhys ap Tewdwr, and was mother of Nest who was the mistress of Henry I of England.
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Abt 1020 - 1069 (~ 49 years)