The Goryeo period (918-1392) was a significant era in Korean history, known for its advancements in culture, art, and technology. It was established by Wang Geon, who became the first king of the Goryeo dynasty. This period is notable for the creation of the famous Goryeo celadon pottery and the development of the Korean script, known as Hangul. During the Goryeo period, Buddhism flourished, influencing various aspects of society and culture. The dynasty also faced challenges, including invasions from the Mongols in the 13th century, which led to significant changes in governance and military structure. Ultimately, the Goryeo dynasty laid the foundation for the later Joseon dynasty.