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 | 4th Earl of Derby Sir William de Ferrers, II (1168-1247)
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 | Agnes de Kevelioc (1174-1247)
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 | 1st Earl of Pembroke William Marshall, the Elder (1146-1219) |
 | 4th Countess of Pembroke Isabella de Clare (1172-1220)
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 | Countess of Cornwall Isabel Marshall (1200-1240)  |
| 5th Earl of Derby Sir William de Ferrers, III (1200-1254)
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| Sibyl Marshall (1209-1245)
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| Joan de Ferrers (1233- ) |
We make every effort to document our research. There is a lot of information that I do not have, and I know there are mistakes in this tree. My feelings will not be hurt if you give me corrections or additional information, especially if you can provide sources for the information.
