Kaeseong was the capital city of the Koryo dynasty (918-1392). It was the centerfold of the politics and economy. During the Koryo dynasty the celadon were the main vessels which royal and high class usually used. So the best of the celadons have been excavated in Kaeseong. They represented the sense of beauty and the gorgeous life of Koryo nobles. The most celadons excavated in Kaesung have the manufactured date on them because they were found in the royal tombs, the Buddhist temple, and other dated monuments. So these dates can be used as the authentic data in the study of Koryo celadon history. For example, the celadons excavated in the Anreung安陵(the tomb of the King Jungchong定宗, 949 A.D.) and the Stupa of the Boolil temple 佛日寺(951 A.D.) play important roles in understanding the early period Koryo celadons. This is because their styles are similar to the celadon of the Chinese Yue kiln(越州窯) and Yaozhou kiln(적주요) which influenced the beginning of the koryo celadon. They also were closely related with the celadons of the Bangsandong kiln(芳山洞窯) and the Wonsanri kiln(元山里窯) which produced celadons from the 9th century to the 11th century. And other cases are the jade-green colored and the inlayed celadons found in the Jangneung長陵(the tomb of the king Injong仁宗, 1146 A.D.), the tomb of Moongongyou (文公裕, 1159 A.D.), the Jineung 智陵(the tomb of the king Myungjong明宗, 1202 A.D.). They suggested the clues to - when the jade-green and inlayed celadons began and how they flourished. Some excavated celadons in Kaeseong made researchers reconsider the beginning point of the application of the inlayed and the slip painted technique on the Koryo celadon. In the Youngneung榮陵(the tomb of the king Kyungjong景宗, 981 A.D.) the inlayed celadons were found and the stylized inlayed celadons were excavated in the Kyungneung 景陵(the tomb of the king Moonjong文宗, 1083 A.D. ). In general the inlayed technique were supposed to be applied on the Koryo celadon in the 12th century. So these excavated celadons are contrary to the main opinion. And the shards which applied the cutting method used on the Punchungsaki粉靑沙器 in the 15th century were also found at the Kyungneung景陵. In the future the direct and sincere investigation of these celadons has to be made. Unfortunately Kaeseong is not accessible to us, South Korean now. I am looking forward to investigating the city freely some day.