Nielsen Hayden genealogy
Descendants of Rhys ap Gruffydd, King of Deheubarth
Abt 1132 - 1197 (~ 65 years)Father: Gruffydd ap Rhys (Abt 1090 - 1137)
Mother: Gwenllian ferch Gruffudd ( - 1136)
Rhys ap Gruffydd, King of Deheubarth (Abt 1132 - 24 Apr 1197 bur.St Davids Cathedral, St. Davids, Pembrokeshire, Wales)
Gwenllian ferch Madog ( - 1160)
   ├─ Gwenllian ferch Yr Arglwydd Rhys ( - 1236)
   │ Ednyfed Fychan ap Cynwrig ab Iorwerth ap Gwgon ( - 1246)
   │    ├─ Gronwy ab Ednyfed Fychan ap Cynwrig ab Iorwerth (of Trecasteil, Anglesey, Wales - 1268)
   │    │ Morfudd ferch Meurig (of Gwent, Wales - ??)
   │    │    └─ Tudur ap Gronwy ab Ednyfed Fychan ap Cynwrig ( - 1311)
   │    │     Angharad ferch Ithel Fychan ab Ithel Gam ap Hen Ithel Gam ap Maredudd ab Uchdrud ab Edwin
   │    │     (of Tegeingl, Wales - ??)
   │    │     (of Tegeingl, Wales - ??)
   │    │        └─ Gronwy ap Tydyr HĂȘn ap Gronwy (of Penmynydd, Anglesey, Wales -
   │    │         1331 bur.Bangor, Gwynedd, Wales)
   │    │         1331 bur.Bangor, Gwynedd, Wales)
   │    │         Gwerfyl ferch Madog (of Hendwr in Edeirnion, Merionethshire, Wales - Aft 1293)
   │    │            └─ Tudur ap Gronwy ( - 1367 Trecasteil, Anglesey, Wales)
   │    │             Margred ferch Thomas (of Iscoed, Ceredigion, Wales - ??)
   │    │                └─ Maredudd ap Tudur ( - Aft 1406)
   │    │                 Margred ferch Dafydd Vychan (of Trefeilir in Malltraeth, Anglesey, Wales - ??)
   │    │                    └─ Owen ap Maredudd ap Tudur (Abt 1400 -
   │    │                     4 Feb 1461 Hereford, Herefordshire, England) =>
   │    │                     4 Feb 1461 Hereford, Herefordshire, England) =>
   │    │                     + Catherine of Valois, Queen Consort of England (27 Oct 1401 Hotel de St. Pol,
   │    │                     Paris, France - 3 Jan 1437 Bermondsey Priory, Surrey, England)(m. Between
   │    │                     1429 and 1430)
   │    │                     Paris, France - 3 Jan 1437 Bermondsey Priory, Surrey, England)(m. Between
   │    │                     1429 and 1430)
   │    ├─ Gwenllian ferch Ednyfed Fychan
   │    │ Tegwared y Baiswen ap Llywelyn ab Iorwerth Drwyndwn ab Owain Gwybnedd (Abt 1200 - ??)
   │    │    └─ Angharad ferch Tegwared y Baiswen ap Llywelyn ab Iorwerth Drwyndwn ab Owain Gwybnedd
   │    │     Gruffudd ap Hywel ap Maredudd ab Einion (Abt 1270 - ??)
   │    │        └─ Ieuan ap Gruffudd ap Hywel (Abt 1300 of Eifionydd, Caernarvonshire, Wales - ??)
   │    │         Efa ferch Gruffudd ap Dafydd Goch ap Dafydd ( - Aft 1351)
   │    │            └─ Nest ferch Ieuan ap Gruffudd (of Eifionydd, Caernarvonshire, Wales - ??)
   │    │             Dafydd Fychan ap Dafydd Llwyd ap Cynwrig (of Trefeilir in Malltraeth, Anglesey, Wales -
   │    │             ??)
   │    │             ??)
   │    │                └─ Margred ferch Dafydd Vychan (of Trefeilir in Malltraeth, Anglesey, Wales - ??)
   │    │                 Maredudd ap Tudur ( - Aft 1406)
   │    │                    └─ This couple were related to each other. Any descendants have been already
   │    │                     been listed
   │    │                     been listed
   │    └─ Gruffudd ab Ednyfed Fychan ap Cynwrig ab Iorwerth ( - 1246)
   │     Margred ferch Einion ap Gwalchmai
   │        └─ Gwenllian ferch Gruffudd ab Ednyfed Fychan
   │         Hywel ap Maredudd ab Einion ap Caradog (Abt 1230 - ??)
   │            └─ Gruffudd ap Hywel ap Maredudd ab Einion (Abt 1270 - ??)
   │             Angharad ferch Tegwared y Baiswen ap Llywelyn ab Iorwerth Drwyndwn ab Owain Gwybnedd
   │                └─ This couple were related to each other. Any descendants have been already been listed
   └─ Gruffudd ab Yr Arglwydd Rhys ( - 25 Jul 1201 Strata Florida Abbey, Ceredigion, Wales)
    Matilda de Briouze ( - 29 Dec 1210 Llanbardarn Fawr, Ceredigion, Wales)
       └─ Owain ap Gruffudd ab Yr Arglwydd Rhys ( - 18 Jan 1236 Strata Florida Abbey, Ceredigion, Wales)
        (Unknown daughter of Gwion Sais)
           └─ Maredudd ab Owain ap Gruffudd ab Yr Arglwydd Rhys ( - Mar 1265 Llanbardarn Fawr, Ceredigion,
            Wales)
            Wales)
            (Unknown daughter of Thomas ap Rhodri)
               └─ Owain ap Maredudd ab Owain ap Gruffudd (of Iscoed, Ceredigion, Wales -
                15 Aug 1275 bur.Strata Florida Abbey, Ceredigion, Wales)
                15 Aug 1275 bur.Strata Florida Abbey, Ceredigion, Wales)
               
                   └─ Llywelyn ab Owain ap Maredudd ab Owain (of Cedewain, Powys, Wales - 1309)
                   
                       └─ Thomas ap Llewellyn ab Owain ap Maredudd (of Iscoed, Ceredigion, Wales - 1343)
                        Elinor ferch Maredudd
                           └─ Margred ferch Thomas (of Iscoed, Ceredigion, Wales - ??) =>
                            + Tudur ap Gronwy ( - 1367 Trecasteil, Anglesey, Wales)