Two entries with the name Ysmaine.

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Ysmaine

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Niece of Brun of Branlant, a vassal who rebelled against Arthur.

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Source
First Continuation of Chrétien’s Perceval | Attributed to Wauchier of Denain, c. 1200

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Ysmaine

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Perceval’s cousin.

She slept with the knight Faradien after receiving his promise to marry her. When Faradien deserted her, Perceval defeated him in combat and forced him to keep his promise.

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Source
Fourth Continuation of Chrétien’s Perceval | Gerbert de Montreuil, c. 1230

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