Aerial view of the inner grounds of Edo Castle, today the location of Tokyo Imperial Palace Edo Castle (江戸城, Edo-jō) is a flatland castle that was built in 1457 by Ōta Dōkan in Edo, Toshima District, Musashi Province.[1] In modern times it is part of the Tokyo Imperial Palace in Chiyoda, Tokyo, and is therefore also known as Chiyoda Castle (千代田城, Chiyoda-jō). Tokugawa Ieyasu established the Tokuga