The Goryeo Dynasty was a Korean dynasty that ruled from 918 to 1392. It was founded by Wang Geon, who unified the Korean Peninsula after a period of fragmentation. The dynasty is known for its advancements in culture, art, and technology, including the creation of the famous Goryeo celadon pottery and the invention of the world's first metal movable type printing. During the Goryeo period, Buddhism flourished, and many temples were built, such as the Haeinsa Temple, which houses the Tripitaka Koreana. The dynasty faced challenges, including invasions by the Mongols, but it maintained a distinct identity and laid the groundwork for the subsequent Joseon Dynasty.