동고산성(東固山城)은 전라북도 전주시 완산구 교동 ·대성동 일원의 승암산에 위치하고 있으며, 전라북도 지방기념물 제 44호로 지정되어 있다. 전주시의 동남쪽 해발 300m 남짓한 승암산(僧巖山)을 에워싸고 있는 포곡식 산성으로 둘레 1,574m, 동서 길이 314m, 남북 길이 256m이다. 성벽은 내탁식으로 축조하였으며, 서쪽구간 중 일부는 기암절벽을 이용하여 쌓았다. 특히 남쪽과 북쪽으로 뻗은 자연 능선을 감아 용도(甬道)와 같은 날개모양의 익성(翼城)이 있는 것이 특징이다. 동고산성의 조사는 주로 내부 시설에 대해서 집중되어있었기 때문에 동고산성의 축성방법, 시기, 성격 등을 파악하는데 많은 제약이 있었다. 하지만 최근의 5차 조사부터는 북문지, 동문지, 남성벽 등 성벽시설에 집중하여 조사가 이루어졌다. 동문지는 일자문 형식의 현문식 구조이며, 동문지 주변성벽 내벽부의 돌출부, 차단벽, 성벽외부, 남쪽측벽 등에서 개축 또는 수축의 흔적이 보임으로써 2차례 이상의 개축 또는 수리과정을 거쳤음을 알 수 있었다. 그 형태를 보면 우선 성벽 안쪽에 차단벽(내옹성)을 두고 차단벽와 성벽사이에 양쪽으로 갈라지는 계단을 설치하여 출입하였으며, 1차례 이상의 수리과정을 거쳤다. 성벽은 내탁식으로 축조하였고, 상부에서는 내벽을 일부 축조하였다. 지대석은 경사진 곳에서는 계단식으로 흙을 잡석과 섞어 다진 다음 쌓았고, 암반이 있는 곳에서는 그랭이 기법을 사용하여 쌓았다. 외벽은 들여쌓기를 하였으며 약간 배부른 형태의 장방형 또는 방형의 석재를 이용하였다. 내벽은 바닥에 흙을 먼저 다지고 장방형 또는 세장방형의 석재를 약간 거칠게 다듬어 사용하였다. 남성벽에 위치한 집수지는 초축시기에는 평면형태 원형의 집수지를 사용하다가 이후 규모를 줄여 평면 말각장방형으로 사용하였다. 배수시설(수구)은 성벽내측으로 암거식과 개거식의 배수구를 만들어 성내부의 물이 효과적으로 입수구를 통하여 배출될 수 있도록 하였고, 성외부에는 바닥에 할석과 잡석을 깔아 물이 잘 흘러내려가도록 하여 물이 고이거나 폐여 성벽의 기반이 약해지는 것을 막았다. 동고산성은 ‘全州城’ 명 기와를 근거로 견훤의 후백제 都城으로 보는 견해가 유력하게 제시되었으나 궁성이라고 판단하기에는 지형상 평지가 적고 성내부가 좁아 궁성으로 활용되었을 가능성은 희박하다고 할 수 있다. 그리고 출토유물에서도 생활용기와 철제무기류 등의 출토량이 소수에 불과해 상시 거주를 목적으로 하는 시설일 가능성 또한 낮다고 볼 수 있다. 그렇다고 한다면 ‘전주성’명 기와는 전주시내와 동고산성 등을 포괄하는 도성(전주성)을 지칭한 것으로 보아야 할 것이다. 궁성은 전주시내 일원에 위치하였을 가능성이 높으며, 동고산성은 그 궁성의 배후산성으로서의 기능하였을 것으로 추정이 가능하다.

This thesis deals with comparing and observing 『Shim Kyoung』 which Donggo wrote to Nammyoung for a present as well as the books written by Nammyoung and Donggo, their growing background and learning, their positions as government officers, and 「Moojinbongsa」 and 「Byounginbongsa」, letters having written to show respect to the King There are more records about Nammyung in 『Donggoyugo』 than in 『Nammyoungjib』. However, I am aware of the fact that the two books have almost the same content in them. 「Nammyoungshimkyoungbal」 has exactly the same content as 『Donggoyugo』. According to the comparition of these two books, I found that Donggo had sent the medicine material, calenda, 『Shimkyoung』, and other things to Nammyoung. Then Nammyoung sent appreciation letters to Donggo. In 『Shimkyoung』, Donggo suggested to Nammyoung that he became a government officer, but Nammyoung was only interested in morality. Donggo sent his son to Deoksan to grieve Nammyoung's death. They had the different pedigrees. Nammyoung's forefathers, who live in Huubcheon, didn't have any big government ranks. However, Donggo's forefathers had high government ranks. In their backgrounds some things are the same and some things are different. The things that were different were that Nammyoung was born in a rural area and his father died when he was 6 years old, but Donggo was born in Seoul and his father died when he was 26 years old. The things they had in common were that they all struggled economically, their mothers were all very clever, and they were not the eldest sons in their families. As they had different pedigrees, in the end Nammyoung became a scholar and Donggo became responsible for the national property. When Nammyoung was studying, I suppose that he was taught about learning from his father. However, Donggo learned about it from Lee, Yeonkyoung and Mr. Thansoo. When they were staying in Hyubcheon and Sangju, I suppose that they went to Hwang, Hyoheon to study, Nammyoung didn't go to school but Donggo went to school. Nammyoung changed his career objectives due to failing the exam to be a government officer, but Donggo started the job as a government officer because he passed it. Nammyoung's highest rank in his life was only Hyunkam, but Donggo was Youngeujung. However, Nammyoung was appointed to a high position by the King. In 「Moojinbongsa」written by Nammyoung, he insisted on 'Respect', which is the important item of his consideration. It is the same that in 「Byounginbongsa」Donggo insisted on 'Harmony' which is an important item of his consideration. In 「Moojinbongsa」, he made clear the troubles of the government officers and suggested to the King that he treat all the problems of the government very strictly. In 「Byounginbongsa」, Donggo insisted harmony and advised that they have to prepare the following King through logic which to choose the talented men. I am aware that both of them did their best with their position at that time. When Doggo was 33 years old, he presented 『Shimkyoung』to Nammyoung. When Donggo gave that. I supposed that he transmitted Nammyoung 'Su-ki-chi-in'(to control themselves by learning) of the important spirit of Confucianism. Nammyoung decided to himself that he would try to study harder when he received the book. Both of them had lived differently but they always cared for their people. The fact Donggo gave a present, 『Shimkyoung』 to Nammyoung. After much consideration, study and hearing from our country's political leaders, I have become aware that there is now more study and consideration being given to our country.