Family: 4th Earl of Hertford Gilbert De Clare (F12335)
The parent family of Lady Isabella De Clare is the Family.
3rd Earl of Hertford Richard De Clare (1153-1218) 
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Countess of Gloucester Amice Fitzrobert (1160-1220)
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Maud De Clare (1184-1213)  |
| Richard De Clare (1184-1228) |
 | 4th Earl of Hertford Gilbert De Clare (1180-1230)
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| Lady Isabella De Clare (1226-1264) |
