Question: When did Eleanor Percy, Duchess Of Northumberland's husband die?
Sentence (from "Algernon Percy, 4th Duke of Northumberland"): Admiral Algernon Percy, 4th Duke of Northumberland, (15 December 1792 – 12 February 1865), styled Lord Algernon Percy from birth until 1816 and known as Lord Prudhoe between 1816 and 1847, was a British naval commander, explorer and Conservative politician.
Relevant evidence: Yes