Family: Fifth Earl Of Derby William De Ferrers / Margaret De Quincy (F870)
m. 1238
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 | 4th Earl of Derby William De Ferrers, II (1168-1247)
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 | Agnes Meschines (1174-1247)
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| Sibyl Ferrers (1216-1247)  |
| Roger Quincy (1195-1264)
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| Countess Of Galloway Helen Canmore (1196-1245)
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| Elizabeth De Quincy (1220-1282) |
| Helen De Quincy (1221-1296) |
| Fifth Earl Of Derby William De Ferrers (1193-1254)
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| Margaret De Quincy (1218-1284)
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| Baroness Berkeley Joan De Ferrers (1248-1309) |