John Rushworth Jellicoe was a British naval officer who served as the commander of the Grand Fleet during World War I. He was known for his strategic leadership and played a crucial role in the Battle of Jutland, the largest naval battle of the war. Jellicoe's cautious approach to the battle has been a topic of historical debate, but he was widely respected for his professionalism and dedication to the Royal Navy. After the war, he held various high-ranking positions in the navy and was later ennobled as the 1st Earl Jellicoe.