Nielsen Hayden genealogy
Descendants of Gwladus ferch Rhiwallon
Father: 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)
    :   
    :        + Walter de Ridelisford (of Carriebenan, Kildare, Ireland - Aft 1226)
    Gerald of Windsor (1070 - Aft 1116)
    :   └─ Maurice fitz Gerald (Abt 1100 - 1 Sep 1176 Wexford, Ireland)
    :    Alice ( - Aft 1170)
    :       └─ Gerald fitz Maurice (Bef 1150 of Offaly, Ireland - Bef 15 Jan 1204) =>
    :        + Eve de Bermingham ( - Abt 1225)
    + Owain ap Cadwgon ( - 1116)