Roy Family Genealogy
Family: Sir John de Ros of Helmsley, KB, Lord Ros / Mary de Percy (F8657)
m. Before 22 Jun 1385
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Sir Thomas de Ros, Lord Ros of Helmsley (1337-1384)
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Beatrix Stafford ( -1415)
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Sir William de Ros, KG, Baron de Ros (1370-1414)  |
| Elizabeth de Ros ( -1424) |
| Sir Henry de Percy, Lord Percy (1322-1368)
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| Joan Orreby ( -1369) |
| Mary de Percy (1367-1394)
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 | Sir John de Ros of Helmsley, KB, Lord Ros (1368-1393)
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