Eustace Clavering Lord of Alnwick, Constable of Knaresborough and Cheshire 1
- Born: Abt 1088, Knaresborough, North Yorkshire, England
- Marriage (1): Agnes de Halton Heiress of Halton and Widnes
- Died: 10 Jul 1157, Alnwick Castle, Northumberland, England about age 69
Eustace married Agnes de Halton Heiress of Halton and Widnes, daughter of William FitzNigel de Cotentin Lord of Halton, Constable of Chester and Agnès De Gand. (Agnes de Halton Heiress of Halton and Widnes was born about 1084 in Halton, Cheshire, England and died about 1166 in Alnwick Castle, Northumberland, England.)
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