The Koryo Dynasty started in 935 and went to 1292 A.D. During this time they developed their own culture in East Asia. They had a bureaucracy during 981 to 997 to replace the old tribe system. They also were fans of Buddism and built many temples. They built many kinds of art. They also made many types of poetry. At one point they lost almost everything when someone set fire to the palace. They were eventually taken over by the Mongols but did get freedom eventually. They reformed but the ruler was assassinated and that ended the Dynasty.