Nielsen Hayden genealogy
Descendants of Gruffudd ap Maredudd
Father: Maredudd ap Bleddyn ap Cynfyn (of Powys, Wales - 1132)
Mother: Hunydd ferch Einudd
Gruffudd ap Maredudd
   └─ 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
       ├─ Gwenwynwyn ( - Abt 1216 Cheshire, England)
       │ Margaret Corbet
       │     + Hawise le Strange ( - 1310)(m. Bef 1242)
       └─ Constance ferch Owain
        David de Malpas
           └─ Idonea de Malpas ( - Bef 1295 Malpas, Cheshire, England) =>
            + Urian de St. Pierre (1220 - Between 1290 and 1300 Cheshire, England)