Family: Piers De Gaveston, [EARL OF CORNWAL / Margaret De Clare, [COUNTESS OF GLO (F5229)
m. 1 Nov 1307
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 | Ernaud De Gaveston (1260- ) |
 | Clarmunda De Marsau Louvigny (1260- ) |
| Joan "of Acre" England, [COUNTESS GLOUCE (1272-1307)
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| Gilbert De Clare, [Earl of Glouces ( -1314) |
| Alianore De Clare (1292-1337)  |
| Elizabeth, Baroness Clare De Clare (1295-1360) |
| Piers De Gaveston, [EARL OF CORNWAL (1284-1312)
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| Margaret De Clare, [COUNTESS OF GLO ( -1342)
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| Amy De Gaveston (1312-1335) |