Family: John de Grey / Avice de Marmion (fam04490)
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 | Sir Sir John de Grey, 1st Baron of Rotherfield (1271-1311)
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 | Margaret de Odingsells (1277-1311)
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| Joane de Grey (1308- )  |
| John de Marmion (1287-1335)
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| Maud de Furnival (1285-1360)
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| Joan de Marmion (1310-1362) |
| John de Grey (1300-1359)
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| Avice de Marmion (1312-1378)
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| John de Grey (1319- ) |
| Robert Marmion de Grey (1345-1367) |
| Maud de Grey (1347- ) |