Isabel Marshal was born 9 October 1200 to William Marshal, 1st Earl of Pembroke (1146-1219) and Isabel de Clare, 4th Countess of Pembroke (1172-1220) and died 17 January 1240 of unspecified causes. She married Gilbert de Clare, 5th Earl of Hertford (1180-1230) 8 October 1217 JL . She married Richard Plantagenet, 1st Earl of Cornwall (1209-1272) 30 March 1231 JL . Notable ancestors include Charlemagne (747-814), Hugh Capet (c940-996). Ancestors are from the United Kingdom, England, France, Germany, Belgium.
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Children
| Offspring of Gilbert Clare and Isabel Marshal (1200-1240) | |||
| Name | Birth | Death | Joined with |
| Agnes de Clare (1218-) | | ||
| Amice de Clare (1220-1287) | | ||
| Richard de Clare, 6th Earl of Hertford (1222-1262) | 4 August 1222 | 15 July 1262 | Megotta de Burgh Maud de Lacy, Countess of Lincoln (1223-c1287) |
| Isabel de Clare (1226-1264) | 2 November 1226 | 10 July 1264 | Robert de Brus (c1210-1295) |
| William de Clare (1228-1258) | | ||
| Gilbert de Clare (1229-) | |||
Children
| Offspring of Richard of Cornwall and Isabel Marshal (1200-1240) | |||
| Name | Birth | Death | Joined with |
| Henry of Almain (1235-1271) | |||
Common ancestors of Isabel Marshal (1200-1240) and Gilbert de Clare, 5th Earl of Hertford (1180-1230)
- Adelaide de Vermandois (1064-1120)
- Adeline de Meulan (c1016-1081)
- Elizabeth de Vermandois (c1081-1131)
- Hugh de Vermandois (1053-1101)
- Robert de Beaumont (1049-1118)
- Roger I de Beaumont (1022-1094)
Footnotes (including sources)
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