Guillaume was the son of Rodolphe I de Faucigny and Constance de Beauvoir. The date and place of his birth have not been found.
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Rodolphe I de Faucigny |
Guillaume I de Faucigny |
Louis I de Faucigny |
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Thietburge von Rheinfelden |
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Constance de Beauvoir |
Burnon de Beauvoir |
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