Nielsen Hayden genealogy
Descendants of Donnchad II
Father: 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)
           │ + Robert de Somerville (of Wichnor in Tatenhill, Warwickshire, England - Bef 17 Oct 1297)
           │ (m. Bef 7 May 1275)
           │ (m. Bef 7 May 1275)
            + Robert de Thweng (of Kilton in Brotton, Yorkshire, England - Bef 1285)