Family: 3rd Earl of Derby William De Ferrers / Sibyl De Brewes (F903)
m. Abt 1166
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 | 3rd Lord Of Bramber William De Braose (1126-1192) |
 | Bertha Fitzmiles (1130-1204) |
| Bertha De Braose (1151-1226)  |
| 3rd Earl of Derby William De Ferrers (1140-1189) |
| Sibyl De Brewes (1155-1227)
|
| Isabel Millicent De Ferrers (1166-1252) |
| 4th Earl of Derby William De Ferrers, II (1168-1247) |