Nielsen Hayden genealogy
Descendants of Rhys ap Tewdyr, King of Deheubarth
- 1093Father: Tewdwr Mawr ap Cadell ab Einion ab Owain (Abt 1000 - ??)
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)
   └─ Gruffydd ap Rhys (Abt 1090 - 1137)
    Gwenllian ferch Gruffudd ( - 1136)
       └─ Rhys ap Gruffydd, King of Deheubarth (Abt 1132 -
        24 Apr 1197 bur.St Davids Cathedral, St. Davids, Pembrokeshire, Wales)
        24 Apr 1197 bur.St Davids Cathedral, St. Davids, Pembrokeshire, Wales)
        Gwenllian ferch Madog ( - 1160)
           │ + Ednyfed Fychan ap Cynwrig ab Iorwerth ap Gwgon ( - 1246)
           └─ Gruffudd ab Yr Arglwydd Rhys ( - 25 Jul 1201 Strata Florida Abbey, Ceredigion, Wales) =>
            + Matilda de Briouze ( - 29 Dec 1210 Llanbardarn Fawr, Ceredigion, Wales)