*Matilda Agnes Fitznigel
born about 1084 Holton, Yorkshire, England
died 1166

father:
*Nigel of Halton
born (estimated 1040) Halton, Yorkshire, England

mother:
unknown

siblings:
*John "Monoculus" Fitznigell born about 1060 Knaresborough, Yorkshire, England died 1138
*William Fitznigel born 1085 Holton, Yorkshire, England died 1153

spouse:
*Eustace Fitzjohn Clavering
born Abt 1080 Of, Knaresborough, Yorkshire, England
died 3 Jul 1157 Wales
married about 1108 Holton, Yorkshire, England

children:
?*Roger Clavering born about 1106? Workworth, Northumberland, England
*Richard Fitzeustace Clavering born about 1128 Holton, Yorkshire, England died 1157

biographical and/or anecdotal:

notes or source:
LDS
ancestry.com
Roger is listed as the child of Richard??
He is descended from Eustace so it is likely it is child.
also from this construction it appears she married her nephew.