| Robert (I) de Ferriéres Earl of Derby ( - 1139) |
William II Peverel ( - ca1147) |
| Hawise |
Avice de Lancaster |
| Robert (II) de Ferriéres Earl of Derby | Margaret Peverel |
| b. d. bef 1160 . 2nd earl. |
b. d. . Heir. |
| > William (I) de Ferrers Earl of Derby < |