Robert de Ferrers I, First Earl of Derby 1
- Born: Abt 1062, Ferrieres-Saint-Hilaire Departement de l'Eure Haute-Normandie, France
- Marriage (1): Hawise de Vitré in 1087 in Brittany, France
- Died: 1139, Burton-on-Trent, Staffordshire, England about age 77
Robert married Hawise de Vitré, daughter of Andreas de Vitré and Agnes de Mortaigne, in 1087 in Brittany, France. (Hawise de Vitré was born on 17 Jul 1069 in Vitré, Ille-et-Vilaine, Bretagne, France and died on 1 Jun 1139 in Burton-on-Trent, Staffordshire, England.)
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