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Ki castle

Ki castle (鬼ノ城, Ki no jō) was an ancient kōgoishi type castle (also known as a Korean-style fortresses in Japan (朝鮮式山城, Chōsen-shiki yamajiro) located in the city of Sōja, Okayama Prefecture, Japan. Its ruins have been protected as a National Historic Site since 1986.[1] Portions of the castle were reconstructed in the early 2000s.
Type:  Korean-style fortresses in Japan (朝鮮式山城, Chōsen-shiki yamajiro)
Built:  c.7th century  
Builder:  Yamato court  

Ki castle  Click to go to Wikipedia