Question: What is the date of death of Harriet Leveson-Gower, Countess Granville's mother?
Sentence (from "Harriet Leveson-Gower, Countess Granville"): Born in Devonshire House, she was the second daughter of the 5th Duke of Devonshire and his first wife, the political hostess Lady Georgiana Spencer.
Relevant evidence: Yes