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Karasawa Castle

Karasawayama Castle (唐沢山城, Karasawayama-jō) was a Japanese castle originally built in the Heian period and used through the end of the Sengoku period. It was located in what is now part of the city of Sano, Tochigi Prefecture, in the northern Kantō region of Japan. The site has been protected as a National Historic Site, since 2014.[1]
Type:  yamashiro-style Japanese castle
Built:  927 AD  
Builder:  Fujiwara no Hidesato  

Karasawa Castle  Click to go to Wikipedia