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Over the course of the Yamato period, in the early centuries of the establishment of a Japanese state, a great number of Korean-style fortresses (朝鮮式山城, Chōsen-shiki yamajiro) were constructed in Japan. Old fortresses dating to the 8th century and earlier can be found all over western Japan. Many of these sites have been identified with fortresses whose construction, repair, and destruction are described in detail in ancient chronicles such as Nihon Shoki and Shoku Nihongi. According to some interpretations of these texts, these fortresses were built under the guidance of, and at the orders of, various members of the Korean nobility or royalty.

Comparisons of these sites have been made to other Japanese fortresses, and to sites of the same period in both Korea and China. The theory persists of direct Korean involvement in the construction of these fortresses and threat of invasion by the Korean Silla dynasty and Chinese Tang dynasty incited the Yamato court to build the Korean influenced castles. Many of the sites have been definitively dated to centuries earlier, however, and so, even if this theory holds for some sites, it does not encompass the majority.

Research on these sites is ongoing, and the questions of the purposes and origins of the fortresses, and their possible connections to Korea remain hotly debated among scholars, in part due to the nationalistic elements involved. Though some scholarship questions the identification of these fortresses with Korean origins, the Japanese term Chōsen-shiki yamajiro (朝鮮式山城, lit. "Korean-style mountain castles/fortresses") continues to be used, likely because of the high probability of Korean influence—Yamato Japan had very little need for major fortifications until that time and likely lacked such expertise, which was then likely contributed by residents of Korean descent. The term kodai yamajiro (古代山城, lit. "old period mountain castle/fortresses") is sometimes used, but its opponents argue that it can be interpreted too broadly; Chōsen-shiki yamajiro, even if not an entirely accurate description, denotes a very particular group of sites.

For the most part, researchers and specialists today doubt the appropriateness of the term "Korean-style fortresses," and continue to propose, research, and develop alternative theories as to the origins and purposes of these fortresses. However, mainstream sources such as newspapers and magazines, continue to represent the widely believed "traditional" version of events put forward by older scholarship, and to use the Korean-related terminology.

Research and debate

Cooperative research and discussions between the two countries, over the issue of determining the origins of these fortresses began in the 1970s. Fortresses of roughly the same type are extant in Korea, but only because they have been repaired or restored, either during the Joseon period or in the 20th century, and thus arguments of their similarity to the Japanese fortresses in question are difficult to prove. On the other hand, enough of the ruins do remain that most scholars believe it obvious that these fortresses in question have far more in common with one another than with other Japanese fortresses, particularly later ones.

Much of the debate over these fortresses began in the late Meiji period (1868–1912) and early Taishō period (1912–1923), when geography and archaeology took off in Japan for the first time, and the classification of kōgoishi fortresses emerged. One key element of the debate was, and continues to be, whether these fortresses were built in the late 7th century, following Japan's defeat in the Battle of Baekgang, as defenses against a possible Silla–Tang invasion of Japan, or whether they were built earlier, possibly independently from the policies or orders of the Yamato court. During the first decades of the 20th century, a vibrant discourse was expounded regarding the time these fortresses were built, their similarities to one another and to Korean structures, the way in which they spread, and the reasons they were built. This debate continues among archaeologists today.

As it relates quite closely to the origins of Japanese culture and society, nationalistic bias on the parts of both Korean and Japanese scholars continues to have a major effect on this discourse.

Sites

See also

• List of foreign-style castles in Japan

Notes and references

1. ^ Turnbull, S.; Dennis, P. (2008). Japanese Castles AD 250--1540. Osprey. p. 26. ISBN 9781846032530. Retrieved 2015-06-20.
2. As the character 「城」is used in Japanese to refer to all variety of fortresses and castles, from the most basic wooden and earthwork defenses to elaborately furnished noble residences with stone foundations, I have taken the liberty of translating the character's archaic pronunciation of ki as "fortress" and the somewhat newer readings of shiro and jō as "castle".

• This article's content is derived largely from that of the corresponding article on the Japanese Misplaced Pages.

• Castles in Japan
• Asuka period
• Nara period