Guillaume was the son of Jean de Poitiers and Isabel Vasques de Sousa. The date and place of his birth have not been found.
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Jean de Poitiers |
Philippe de Poitiers |
Charles de Poitiers |
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Simonne de Méry |
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Catherine de Paillart |
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Isabel Vasques de Sousa |
Afonso Vasques de Sousa |
Vasco Martins de Sousa Chichorro |
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Leonor Lopes de Sousa |
Lopo Dias de Sousa |
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