What was the first ironclad battleship?

The first ironclad battleship in the world is best recognized as one "turtle boat" that was used in the Korean Navy long before the west ever did. They are documented in combat in the 16th century. "Turtle ships are famous for participating in numerous victories against Japanese naval forces that supported Toyotomi Hideyoshi's attempts to conquer Korea from 1592-1598, inflicting heavy losses. Korean admiral Yi Sun-sin is credited with designing and building the craft known today. " (Wikipedia) However, in the west, the first ironclad battleship was called "Gloire" and was built in 1859 by the French during the Crimean war. In the Crimean War (1853�56) the French and British successfully attacked Russian fortifications with �floating batteries,� ironclad barges mounting heavy guns. In 1859 the French completed the first iron warship, the Gloire; its iron plates, 4.5 in. (11 cm) thick, were backed by heavy timber. Britain and the U.S. soon followed.