HMS Illustrious (1896) was a Majestic-class pre-dreadnought battleship built at Chatham Dockyard, with her keel laid in March 1895 and launched in September 1896. She was commissioned into the Royal Navy in April 1898 and served until 1919. The vessel measured 421 feet (128 meters) in length overall, with a beam of 75 feet (23 meters) and a draft of 27 feet (8.2 meters). Displacing up to 16,060 long tons (16,320 metric tons) at full load, she was powered by two 3-cylinder triple-expansion steam engines, which drove eight coal-fired Scotch marine boilers, later re-boilered with oil-fired models around 1907–1908. Her engines produced a top speed of 16 knots (30 km/h; 18 mph), and she was crewed by approximately 672 officers and ratings. Armament comprised a main battery of four 12-inch (305 mm) Mk VIII guns mounted in twin turrets—one forward and one aft—placed on circular barbettes, differing from some sister ships which retained pear-shaped barbettes. Her secondary armament included twelve 6-inch (152 mm) guns in casemates on two decks amidships, along with sixteen 12-pounder and twelve 2-pounder guns for defense against torpedo boats. She also carried five 18-inch (457 mm) torpedo tubes, four submerged and one deck-mounted. Her armor protection featured a belt of Harvey steel 9 inches (229 mm) thick, allowing for a lighter and deeper belt without sacrificing protection. The main battery barbettes were armored with 14 inches (356 mm) of steel, and the conning tower had similar armor. The armored deck ranged from 2.5 to 4.5 inches (64 to 114 mm) in thickness. Illustrious's service included participation in the Mediterranean during the intervention in Crete in 1898 and later activities with the Channel and Atlantic Fleets. She became part of the Home Fleet in 1908, serving as flagship at times, and underwent several collisions and refits. During World War I, she initially served as a guard ship at various locations, including Loch Ewe, Loch Na Keal, the Tyne, and Grimsby. In 1915, her main armament was removed, and she was repurposed as a store ship, later serving as a munitions storeship until her decommissioning in 1919. She was sold for scrapping in 1920, ending her nearly two-decade-long career as a significant component of the Royal Navy's pre-dreadnought fleet.

This description has been generated using GPT-4.1-NANO based on the Vessel's wikidata information and then modified by ShipIndex.org staff.