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Isawa Castle

Isawa Castle (胆沢城, Isawa-jō) was an early Heian period jōsaku-style Japanese castle located in what is now part of the city of Ōshū, Iwate in the Tōhoku region of far northern Honshu, Japan. The site was proclaimed a National National Historic Site in 1922.[1]
Type:  jōsaku-style Japanese castle
Built:  802 AD  
Builder:  Sakanoue no Tamuramaro  

Isawa Castle  Click to go to Wikipedia