Iwakisan Kōgoishi
| Iwakisan Kōgoishi (石城山神籠石) was an ancient castle (also known as a Korean-style fortresses in Japan (朝鮮式山城, Chōsen-shiki yamajiro) located in the city of Hikari, Yamaguchi Prefecture, in the San'yō region of Japan. Its ruins have been protected as a National Historic Site since 1951.[1] | ||||||
| Type： Korean-style fortress | ||||||
| Built： Asuka Period | ||||||
| Builder： Yamato court | ||||||
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