Rhiwallon ap Cynfyn, was a Welsh King, following the 1063 invasion of Wales by Harold and Tostig Godwinson, he was an Anglo-Saxon Earl of which location, that overthrew Gruffydd, Rhiwallon and Bleddyn jointly?
Rhiwallon ap Cynfyn Rhiwallon ap Cynfyn (c. 1020 – c. 1069 ) was a Welsh King. the son of Cynfyn ap Gwerstan and brother of King Bleddyn of Powys. Through his mother Angharad, he was half-brother to King Gruffydd ap Llywelyn as well. Following the 1063 invasion of Wales by Harold and Tostig Godwinson that overthrew Gruffydd, Rhiwallon and Bleddyn jointly received Powys and Gwynedd on condition of faithfully serving Edward the Confessor "everywhere by water and by land".
Hamelin de Ballon Hamelin de Ballon (or Baalun, Baalan, Balun, Balodun, Balon, etc.), alias Hamelin de Barham (b ca. 1060, died 5 March 1105/6, or earlier 1090, per the Battle Abbey Roll) was an early Norman Baron and the first Baron Abergavenny and Lord of Over Gwent and Abergavenny, titles granted shortly after the Norman conquest of England and Wales by William the Conqueror; he also served William Rufus.