| Male 4th Earl of Derby William De Ferrers |
| Birth | Abt. 1162 | Ferrers, Derbyshire, England |
| Death | 22 Sep 1247 | |
| Burial | ||
| Marriage | ||
| Father | Walkelin (Wm) De Ferrieres | F1333 Group Sheet | |
| Mother | Sybil De Braose | F1333 Group Sheet | |
| Male + 5th Earl of Derby William Ferrers |
| Birth | 1193 | Derbyshire, England |
| Death | 24 Mar 1254 | Evington, Leicestershire, England |
| Burial | ||
| Spouse | Margaret De Quincy | F1331 | |
| Marriage | 1238 | |