Guillaume was the son of Guy de Brienne and Pétronille-Élisabeth de Chacenay. The date and place of his birth have not been found.
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Guy de Brienne |
Milon II de Brienne |
Gautier I de Brienne |
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Eustachie de Tonnerre |
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Mathilde de Noyers |
Miles II de Noyers |
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Pétronille-Élisabeth de Chacenay |
Anséric de Montréal |
Milon de Montréal |
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Adelaïs de Baudément |
André de Baudément |
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Agnès de Braine |