Question: What is the date of death of Blanche Cavendish, Countess Of Burlington's husband?
Sentence (from "William Cavendish, 7th Duke of Devonshire"): William Cavendish, 7th Duke of Devonshire, (27 April 1808 – 21 December 1891), styled as Lord Cavendish of Keighley between 1831 and 1834 and known as The Earl of Burlington between 1834 and 1858, was a British landowner, benefactor, nobleman, and politician.
Relevant evidence: Yes