Mademoiselle de Tonnay-Charente in The Man in the Iron Mask
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Mademoiselle de Tonnay-Charente
We first meet her in Chapter Thirty-Four, when she is hell-bent on shaming Louise de la Valliere. Her treacherous nature lends itself well to consolidating power, and when we next see her in the Epilogue, she's got the King wrapped around her pinky.