Edo Castle (江戸城, Edo-jō), also known as Chiyoda Castle (千代田城, Chiyoda-jō), is a flatland castle that was built in 1457 by Ōta Dōkan. It is today part of the Tokyo Imperial Palace and is in Chiyoda, Tokyo, then known as Edo, Toshima District, Musashi Province. Tokugawa Ieyasu established the Tokugawa shogunate here.