Guillaume was the son of Robert Guiscard de Hauteville and Sikelgaita de Salerne. The date and place of his birth have not been found.
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Robert Guiscard de Hauteville |
Tancrède de Hauteville |
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Frédésende |
Richard I de Normandie |
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Sikelgaita de Salerne |
Guaimar IV (V) de Salerne |
Guaimar III de Salerne |
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Gaitelgrima de Benvenuto |
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