The St. John Genealogy Project
Origin and Ancestry DNA Database & Electronic Archive
1220 - 1262 (42 years) 
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Richard de Clare, m. Maud de Lacy |
| 1220 - 1262 (42 years) |
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Isabel de Clare, de Bruce |
 1222 - |
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Susan de Clare, m. Gwenhuwin |
| 1225 - |
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William de Clare |
| 1226 - |
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Gilbert de Clare |
| 1227 - |
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Petronilla de Clare, St. John, of Instow, Devon, England (alleged wife) |
| 1229 - 1320 (91 years) |
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Eva Marshall, m. William Braose |
| 1194 - Bef 1246 (51 years) |
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Isabel Marshall, de Clare, Countess of Cornwall |
| 1200 - 1240 (39 years) |
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Gilbert de Clare, Earl of Hertford & Gloucester; Surety of the Magna Carta |
| 1182 - 1230 (48 years) |
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Isabel de Clare, m. William Marshall |
| 1172 - 1220 (48 years) |
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William Marshall, m. Isabel de Clare |
| Abt 1146 - 1219 (73 years) |
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Aoife MacMurrough, m. Richard de Clare |
| 1145 - 1187 (43 years) |
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Richard fitzGilbert de Clare, m. Aoife MacMurrough |
| 1130 - 1176 (46 years) |
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