Nielsen Hayden genealogy
Descendants of Isabel de Ferrers
Father: Robert de Ferrers ( - 1139)
Mother: Hawise
Isabel de Ferrers
Robert de Cauz ( - Abt 1139)
   └─ Robert de Cauz ( - Bef 1167)
    Sybil Basset (Abt 1135 of Drayton Basset, Staffordshire, England - ??)
       └─ Maud de Cauz ( - Bef 25 May 1224)
        Adam de Birkin (of Laxton, Nottinghamshire, England - 1185)
            + Robert le Vavasour (of Addingham, Yorkshire, England - Bef 1228)