Family: Sir William de Ferrers, Knight / Joan Ann Despenser (F2935)
William de Ferrers, Earl of Derby (1200-1254) 
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Margaret de Quincy (1222-1284)
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| Robert de Ferrers, Earl of Derby (1239-1279) |
| Agnes de Ferrers (1244- ) |
| Elizabeth de Ferrers (1246- ) |
Joan de Ferrers (1255-1310)  |
| Sir William de Ferrers, Knight (1240-1287)
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| Joan Ann Despenser (1242- ) |