Algernon Percy, 4th Duke of Northumberland, KG, PC, FRS, FSA, FRGS, FRAS (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.

[1] Northumberland entered the Royal Navy in March 1805, aged 12, on board HMS Tribune and served in the Napoleonic Wars.

In 1852 he was sworn of the Privy Council[10] and appointed First Lord of the Admiralty, with a seat in the cabinet, by the Earl of Derby, a post he held until the fall of the government in December 1852.

As a result of gout in his right hand, he died in February 1865, aged 72 at Alnwick Castle and was buried in the Northumberland Vault, within Westminster Abbey.

[2] Northumberland was a good friend of Arctic explorer Sir John Franklin, and Prudhoe Bay, on the north coast of Alaska, was named after him.