Family: Gilbert De Clare, Earl / Isabel Marshall, [Countess Of Cor (F1325)
m. 9 Oct 1217Richard De Clare, Earl (1162-1218) 
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Amice Fitzrobert, Countess (1160-1225)
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| Isabel De Clare (1178- ) |
Maud (Matilda) De Clare (1184-1213)  |
| Joane De Clare (1184- ) |
| Richard De Clare (1186-1228) |
| William Marshall, Earl (1146-1219)
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| Isabel Fitzgilbert De Clare, Countess (1172-1220)
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| Margaret Marshall (1190- ) |
| Maud (Matilda) Marshall, Countess (1192-1248) |
| Eve Marshall (1194-1245) |
| Gilbert Marshall, Earl (1196-1241) |
| William Marshall, Earl (1198-1222) |
| Richard Marshall, Earl (1200-1234) |
| Joane Marshall (1202-1234) |
| Anselm Marshall, Earl (1204-1245) |
| Walter Marshall, Earl (1206-1245) |
| Sibyl Marshall (1209-1245) |
| Gilbert De Clare, Earl (1182-1230)
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| Isabel Marshall, [Countess Of Cor (1206-1240)
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| Maud De Clare (1210- ) |
| Joan De Clare (1210- ) |
| Susan De Clare (1217- ) |
| Amica De Clare, [Countess Of Dev (1220-1287) |
| Richard De Clare, [Earl Of Glouces (1222-1262) |
| Isabel De Clare (1226-1264) |
| William De Clare, [Sir Knight] (1228-1258) |
| Adeliza De Clare (1228- ) |
| Gilbert De Clare (1229-1242) |
| Agnes De Clare (1229- ) |