Nielsen Hayden genealogy
Descendants of Thomas ap Rhodri ab Owain Gwynned
Abt 1170 -Father: Rhodri ab Owain Gwynned ( - 1195)
Thomas ap Rhodri ab Owain Gwynned (Abt 1170 - ??)
   └─ (Unknown daughter of Thomas ap Rhodri)
    Maredudd ab Owain ap Gruffudd ab Yr Arglwydd Rhys ( - Mar 1265 Llanbardarn Fawr, Ceredigion, Wales)
       └─ 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) =>
            +