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The Edo Castle (Edojyou) originated from its construction on 1457 by Dokan Ota, the minister of
the Daimyo Sadamasa Uesugi.
It is thought that this Edojyou corresponded to the former inner circle (Kyu-Honmaru) of the present Imperial Palace and its surroundings, and that this size was no more than one
tenth of the Edojyou in the Edo era. As it is seen in the famous tanka (a Japanese poem of thirty-one syllables) above, Doukan was proud of this castle, staying inside which one can command
all four views of Mt. Fuji, the Musasino Plain, the Sumida river, and Mt. Tsukuba.
On 1524, the castle went to the hands of Naokage and Tsunakage Toyama, the followers
of Daimyo Ujitsuna Hojyo, and after the Houjyou was ruined, Ieyasu Tokugawa entered in the castle on 1590.
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