Marcia Brent, Marchioness of Caterham

In the novel The Secret of Chimneys, Marcia Brent, Marchioness of Caterham is the sister-in-law of Lord Caterham. She is the widow of his brother Henry, the 8th Marquis of Caterham. Her father was the Duke of Perth. The Marchioness often gives advice to her nieces.