While Henry was still deeply grieving over the death of Gabrielle d'Estrées,[1][2] she induced him into a written promise to marry her.

This led to bitter scenes of jealousy and arguing at the court when shortly afterwards Henry married Marie de' Medici instead.

[1] Terribly infuriated and feeling betrayed, she carried her spite so far as to be deeply compromised in a conspiracy against the king in 1608, but escaped with only a slight punishment after the plot was foiled,[3] and in 1608 Henry took her back into favour again as one of his mistresses.

[4] Upon the King's death, his wife, Marie de' Medici, was named Regent by Parliament, and immediately exiled Catherine from the royal court.

[6] She had two children with the king:[7] Media related to Catherine Henriette de Balzac d'Entragues at Wikimedia Commons