The St. John Genealogy Project
Origin and Ancestry DNA Database & Electronic Archive
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 | John (I) Beaufort, Earl of Somerset (1371-1410)
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 | Margaret Holland ( -1440) |
| 1st Duke of Somerset John (II) Beaufort (1404-1444)  |
| Richard ap Thomas Beauchamp, 13th Earl of Warwick; m. Elizabeth de Berkeley m. isabella Despenser (1382-1439)
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| Edmund Beaufort, 2nd Duke of Somerset (1406-1455)
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