Nielsen Hayden genealogy
Descendants of Haer ferch Cillin
Father: Cillin y Blaidd Rhudd
Haer ferch Cillin
   └─ Maredudd ap Bleddyn ap Cynfyn (of Powys, Wales - 1132)
    Hunydd ferch Einudd
       ├─ Madog ap Maredudd, Prince of Powys Fadog ( - 1160 Winchester, Hampshire, England)
       │ Susanna ferch Gruffydd ap Cynan
       │ :   └─ Gryffydd "Maelor" ap Madog, Prince of Northern Powys (of Powys Fadog, Wales -
       │ :    1191 Castle of Dinas Bran, Nanheudwy, Wales) =>
       │ :    1191 Castle of Dinas Bran, Nanheudwy, Wales) =>
       │ :    + Angharad ferch Owain
       │ (Unknown wife or mistress of Madog ap Maredudd)
       │    │ + 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)
       │    ├─ Owain Brogyntyn ap Madog ap Maredudd ap Bleddyn, King of Powys =>
       │    │ + Margred ferch Einion ap Seissyll
       │     + Iorwerth Drwyndwn ap Owain Gwynedd ( - Abt 1174)
       └─ Gruffudd ap Maredudd
        Gwerful ferch Gwrgeneu
           └─ Owain Cyfeiliog ap Gruffudd ap Maredudd ap Bleddyn ap Cynfyn (Abt 1130 -
            1197 Monastery of Strata Marcella, Welshpool, Montgomeryshire, Wales) =>
            1197 Monastery of Strata Marcella, Welshpool, Montgomeryshire, Wales) =>
            + Gwenllian ferch Owain