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In page Biette de Cassinel:

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Biette was married to Gérard de Montagu by 1336.[2] She was the mother of Jean de Montagu, who would rise to become Grand Master of France.[3] It is said by some that Jean was her son by Charles V,[citation needed] while Merlet and Delachenal state there is no evidence for this.[b] Autrand states that a clerk of Parlement skipped two words, concerning Jean's execution, which incorrectly attributed Charles V as Jean's father, instead of his legitimate father Gerard de Montaigu.[5]