| William (II) de Ferrers Earl of Derby (ca1170 - 1247) |
Roger de Quency Earl of Winchester ( - 1264) |
| Agnes de Kivelioc ( - 1247) |
Helena (ca1208 - >1245) |
| William (III) de Ferrers Earl of Derby | Margaret de Quency |
| b. ca 1193 d. 24 Mar 1254, Evington, Nr Leicester . 5th earl. Constable of Bolsover castle. |
b. bef 1223 d. bef 12 Mar 1281 . 1st dau & co-heir. Constable of Scotland. |
| Spouses: 1, 2 |
| > Robert (III) de Ferrers Earl of Derby < > Joan de Ferrers < > Sir William Ferrers < Agnes de Ferrers Maud de Ferrers |