Family: Duke of Lancaster Duke of Lancaster Henry of Lancaster / Isabel de Beaumont (fam04306)
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 | Lady Lady Maud de Chaworth (1282-1322)
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| Blanche of Lancaster (1305- ) |
| Maud Lancaster (1310- )  |
| Joan Plantagenet (1310-1349) |
| Eleanor Plantagenet (1311-1371) |
| Isabel of Lancaster (1317- ) |
| Princess Princess Mary of Lancaster Plantagenet (1320-1362) |
 | Henry de Beaumont (1285-1339)
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| Alice Comyn (1289-1349)
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| Joan de Beaumont (1309- ) |
| Catherine de Beaumont (1315-1368) |
| Thomas de Beaumont (1315- ) |
| John de Beaumont (1318- ) |
| Isabel de Beaumont (1310-1360)
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| Maud of Lancaster (1335-1362) |
| Princess Princess Blanche Plantagenet (1345-1369) |