Key points are not available for this paper at this time.
It is estimated that Yiseong Fortress was renovated along with Samnyeon Fortress. Gulsan Fortress has been discussed as an important strategic point for Silla in the west region of the Sobaeksan Mountain during the battle of the Three Kingdoms. In particular, the article on the renovation of Gulsan Fortress in the Samguksagi is mentioned as an important historical event that can examine Silla's strategy for external expansion, provinces governance, and depense system in the surrounding area. Specifically, it is believed that Yiseong Fortress served as an administrative and military base for Silla as well as a military base. In this paper, the status of Yiseong Fortress was examined using the spatial analysis method of GIS. First, in relation to the characteristics of the administrative ruling place, Yiseong Fortress had accessibility and control in terms of topography and geography. Yiseong Fortress was located in a low hill, so it was relatively easy to access compared to the mountain fortresses of the highlands. This means that it is equipped with conditions to more efficiently control the surrounding human and economic resources. In addition, it was found that effective control of the local people and the agricultural production infrastructure was also possible through the analysis of the relationship between the provinces and settlements. Yiseong Fortress was the only one located in Okcheon and Boeun in a nodule where land and waterways intersect. As a result of a proximity analysis of the fortresses around Chupungryeong-ro, which Silla used as an diplomatic expansion route, it was confirmed that Yiseong Fortress was recently in close proximity. This is consistent with the historical fact that Silla pioneered the arterial road network, completing the local organizational system around the Hub Fortress, and reorganizing the government ruling system. In addition, Yiseong Fortress also had the advantage of using the waterway network that was operated upstream of the Geumgang River. In other words, Yiseong Fortress would have played a role in securing or supplying goods secured in Boeun or Cheongsan through waterways as the center of the amphibious transportation network. Yiseong Fortress was included in the fortress group in the Okcheon area, which was at the forefront of confrontation with Baekje. This can be assumed as a regional government-level system, and the spatial status of Yiseong Fortress was examined through network analysis. As a result of the analysis, Yiseong Fortress advantageous in securing power and influence in the network composed of fortresses, and occupied a position to exert a strong ripple effect using his power as well as his role as an intermediary. This spatial status of the Okcheon Yiseong Fortress is considered to have served as the background for the renovation of Gulsan Fortress during the period between Soji-maripgan.
Dongseok Kang (Wed,) studied this question.