Nielsen Hayden genealogy
Family: Robert Curthose / Sibyl of Conversano (F954)
m. Sep 1100William I, King of England (1028-1087) 
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Matilda of Flanders, Queen Consort of England (1032-1083)
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| Alice ( -1112) |
| Cecily ( -1126) |
| Richard (1055-1075) |
| William II "Rufus", King of England (1060-1100) |
Constance (1061-1090)  |
| Adela of Normandy (1061-1137) |
| Henry I, King of England (1068-1135) |
| Goffredo of Conversano ( -1101) |
| Sibyl of Conversano ( -1103)
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| Robert Curthose (1051-1134)
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| William Clito (1102-1128) |