Nielsen Hayden genealogy
Family: Robert de Ros / Isabel of Scotland (F4623)
m. 1191Everard de Ros (1145-1183) 
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Roese Trussebut (1151-1186)
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| William I "The Lion", King of Scotland (1142-1214)
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| Robert de Ros (1172-1226)
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Robert de Ros ( -1269)  |
| William I de Ros (1193-1258) |