The St. John Genealogy Project
Origin and Ancestry DNA Database & Electronic Archive
 MaleGilbert de Clare, Earl of Hertford & Gloucester; Surety of the Magna Carta |
| Birth | 1182 | Hertford, Hertfordshire, England, UK  |
| Death | 25 Oct 1230 | Penros or La Grée-Saint-Laurent, Morbihan, Brittany, France |
| Burial | Tewkesbury Abbey, Gloucestershire, England, UK |
|
| Marriage | ||
| Father | Richard de Clare, m. Amice FitzWilliamfitz Robert de Caen of Gloucester | F5949 Group Sheet | |
| Mother | Amice fitz William de Caen | F5949 Group Sheet | |
 FemaleIsabel Marshall, de Clare, Countess of Cornwall |
| Birth | 9 Oct 1200 | Pembroke Castle, PEmbrokeshire, Wales, UK |
| Death | 15 Jan 1240 | Berkhampstead, Berkhamsted, Hertfordshire, England, UK |
| Burial | ||
| Father | William Marshall, m. Isabel de Clare | F6025 Group Sheet | |
| Mother | Isabel de Clare, m. William Marshall | F6025 Group Sheet | |
| Male + Richard de Clare, m. Maud de Lacy |
| Birth | 1220 | |
| Death | 1262 | |
| Burial | ||
| Spouse | Maud de Lacy, de Clare | F3450 | |
| Marriage | ||
| Female + Isabel de Clare, de Bruce |
| Birth | abt. 1222 | |
| Death | ||
| Burial | ||
| Spouse | Robert de Bruce, 5th Lord of Annandale | F401147 | |
| Marriage | ||
| Female + Agnes de Clare, m. Henry de Tracy of Barnstaple, Devon |
| Birth | bef. 1230 | |
| Death | ||
| Burial | ||
| Spouse | Henry III de Tracy, of Barnstaple m.? Agnes de Clare | F6373 | |
| Marriage | ||
| Female + Petronilla de Clare, St. John, of Instow, Devon, England (alleged wife) |
| Birth | abt. 1229 | Tewkesbury, Gloucestershire, England, UK |
| Death | 1320 | Devon, England, UK |
| Burial | ||
| Spouse | Sir John II St. John, knight, m. Petronilla de Clare, of Instow | F905 | |
| Marriage | abt. 1242 | Devon, England, UK |
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