Nielsen Hayden genealogy
Descendants of Llywelyn ab Owain ap Maredudd ab Owain
- 1309Father: Owain ap Maredudd ab Owain ap Gruffudd (of Iscoed, 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)
            + Margred ferch Dafydd Vychan (of Trefeilir in Malltraeth, Anglesey, Wales - ??)