Nielsen Hayden genealogy
Descendants of Rhiwallon ap Cynfyn
Abt 1020 - Abt 1069 (~ 49 years)Father: Cynfyn ap Gwerystan (Abt 1000 - ??)
Mother: Angharad ferch Maredudd
Rhiwallon ap Cynfyn (Abt 1020 - Abt 1069)
   └─ Gwladus ferch Rhiwallon
    Rhys ap Tewdyr, King of Deheubarth ( - Apr 1093 Brycheiniog, Wales)
       └─ Nest ferch Rhys (Abt 1085 - Bef 1136)
        Henry I, King of England (1068 - 1 Dec 1135 Lyon-la-ForĂȘt, near Rouen, Seine-Maritime, Normandy, France)
        :   └─ Henry fitz Roy (Abt 1105 of Pembrokeshire, Wales - 1157 Anglesey, Wales) =>
        :    +
        Gerald of Windsor (1070 - Aft 1116)
        :   └─ Maurice fitz Gerald (Abt 1100 - 1 Sep 1176 Wexford, Ireland) =>
        :    + Alice ( - Aft 1170)
        + Owain ap Cadwgon ( - 1116)