Family: William (5th\7th Earl of Derby) Ferrers / Sibyl (Le Mareschal) (of Pembroke) Marshal (F1767)
m. 14 May 1219
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 | William (4th Earl of Derby) de Ferrers (1168-1247) |
 | Agnes De Kevelioch (1168- ) |
| William (4th Earl of Pembroke) Marshal (1146-1219)
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| Isabel (Countess Strigoil) De Clare (1174-1220)
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| Joan (of Pembroke) Marshal ( -1235)  |
| William (5th Earl of Pembroke) Marshal (1190-1231) |
| Isabel (of Pembroke) Marshal (1200-1240) |
| Maud (of Pembroke) Marshal ( -1248) |
| Walter (8th Earl of Pembroke) Marshal (1199-1245) |
| William (5th\7th Earl of Derby) Ferrers (1193-1254)
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