Question: What is the date of death of Blanche Cavendish, Countess Of Burlington's husband?
Sentence (from "Blanche Cavendish, Countess of Burlington"): Blanche Cavendish, Countess of Burlington ("née" Howard; 11 January 1812 – 27 April 1840) was the wife of William Cavendish, 2nd Earl of Burlington, who would later become the 7th Duke of Devonshire.
Relevant evidence: Yes