Unified Silla was replaced by the Goryeo (also called Koryo) dynasty, from which the modern name "Korea" derives. One highlight of the Goryeo dynasty was that in 1234 the world's first metal movable type was invented by a Korean named Choe Yun-ui (200 years before Gutenberg's printing press). Goryeo was replaced by the Joseon (also calledChosun) dynasty, after a coup by one of its generals. The Joseon dynasty ruled Korea from 1392 to 1910, being one of the longest actively ruling dynasties in world history. It was during the early part of the Joseon dynasty that Korean technological inventions such as the world's first water clock, ironclad ship, and other innovations took place. During the rule of King Sejong the Great, the world's first rain gauge was invented and the Korean alphabet known as hangulwas created.