Jisho

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Wikipedia definition
1. Miyao Castlewas a fortification built on the island of Itsukushima (also known as Miyajima) during the Age of Warring States in Japan. Although referred to as a Japanese castle, it did not have a donjon (tenshu) or serve as the residence of a land-holding noble, and therefore is probably more within the definition of a hill fort, rather than a true castle.
Read “Miyao Castle” on English Wikipedia
Read “宮尾城” on Japanese Wikipedia
Read “Miyao Castle” on DBpedia

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