Admiral Sir John Jellicoe was a British naval officer best known for his role during World War I. He commanded the Royal Navy at the Battle of Jutland in 1916, which was the largest naval battle of the war. Jellicoe's leadership and strategic decisions were crucial in maintaining British naval dominance. Born on December 5, 1859, Jellicoe joined the Royal Navy at a young age and quickly rose through the ranks. After the war, he served in various positions, including as the Governor-General of New Zealand. He passed away on November 20, 1958, leaving a significant legacy in naval history.