Robert de Ferrers, 1st Earl of Derby, was born circa 1062 to Henry de Ferrières (c1030-) and Bertha Roberts (c1040-) and died 1139 of unspecified causes. He married Hawise de Vitré (c1069-) .
Children
| Name | Birth | Death | Joined with |
| William de Ferrers (-bef1139) | |||
| Robert de Ferrers, 2nd Earl of Derby (-1162) | 1162 | Margaret Peverel (c1144-) | |
Footnotes (including sources)
| ‡ General |