Nielsen Hayden genealogy
Descendants of Donnchad I
Donnchad I
   └─ Donnchad II
   
       └─ Ada
        Roger de Merlay (of Morpeth, Northumberland, England - ??)
           └─ Roger de Merlay (of Morpeth, Northumberland, England - Bef 4 Dec 1265) =>
            + Isabel de Ros ( - Bef 7 May 1275)(m. Bef 1241)