Family: Sir William de Ros / Lucy FitzPeter (F7408)
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 | Baron of Helmsley Robert de Ros (1170-1226)
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 | Isabella Mac William (1175-1226)
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 | Sir William de Ros (1192-1264)
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| Lucy FitzPeter (1205-1266) |
| Sir Robert de Ros (1223-1285)  |