Family: Robert De Harcourt / Isabel Margaret Byron (F10841)
m. 1440
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 | Thomas Harcourt (1377-1420)
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 | Joan Francis (1383-1449)
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| Richard Harcourt (1416-1486)  |
| John Byron (1371-1465)
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| Margaret Margery Booth (1380-1460)
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| Elizabeth de Byron (1398-1460) |
| Richard Byron (1404-1449) |
| Helena Byron (1416-1467) |
| Robert De Harcourt (1410-1470)
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| Isabel Margaret Byron (1412-1486)
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| John de Harcourt, III (1451-1484) |