Family: Henry PLANTAGENET, 1st Duke of Lancaster / Isabel DE BEAUMONT (F22573)
m. Bef 23 Jun 1330
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 | Henry PLANTAGENET, 3rd Earl of Lancaster (1281-1355)
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 | Maud DE CHAWORTH (1282-1322)
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| Eleanor PLANTAGENET, Countess (1318-1372)  |
| Mary PLANTAGENET, of Lancaster ( -1362) |
| Alice COMYN, Countess of Buchan, Lady Beaumont (1289-1349)
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| John DE BEAUMONT, 2nd Lord Beaumont (1318-1342) |
| Isabel DE BEAUMONT (1320- )
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| Henry PLANTAGENET, 1st Duke of Lancaster (1310-1361)
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| Blanche PLANTAGENET, Duchess of Lancaster (1345-1369) |