Question: Who is the maternal grandmother of Henri, Duke Of Verneuil?
Sentence (from "Catherine Henriette de Balzac d'Entragues"): Catherine Henriette de Balzac d'Entragues, Marquise de Verneuil (1579–1633) was the favourite mistress of Henry IV of France after Gabrielle d'Estrées died: her sister Marie-Charlotte de Balzac d’Entragues was also a mistress of the king.
Relevant evidence: No