Lewis-Powers Family History
The Genealogy of the Lewis-Powers Family
Family: William De Ferrers / Lady Sybil de Braose, Countess of Derby (F316)
Lady Bertha de Fitzwalter, Duchess of Gloucester (1130-1204) 
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| Matilda De Braose (1150- ) |
| Bertha de Braose (1151-1240) |
| Engeram de Braose (1154-1226) |
William IV De Braose (1155-1210) |
| William De Ferrers (1170-1246) |
| Lady Sybil de Braose, Countess of Derby (1157-1227)
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| William I DeFerrers (1162-1247) |
Agatha De Ferrers (1166-1216)  |