Edo Castle in the context of "Castle"

The Imperial Palace (皇居, Kōkyo; lit. 'Imperial Residence') is the main residence of the emperor of Japan. It is a large park-like area located in the Chiyoda district of the Chiyoda ward of Tokyo and contains several buildings including the Fukiage Palace (吹上御所, Fukiage gosho) where the emperor has his living quarters, the main palace (宮殿, Kyūden) where various ceremonies and receptions take place, some residences of the Imperial Family, an archive, museums and administrative offices.

The 1.15-square-kilometer (0.44 sq mi) palace grounds and gardens are built on the site of the old Edo Castle.

The Tokugawa shogunate, also known as the Edo shogunate, was the military government of Japan during the Edo period from 1603 to 1868.

The Tokugawa shogunate was established by Tokugawa Ieyasu after victory at the Battle of Sekigahara, ending the civil wars of the Sengoku period following the collapse of the Ashikaga shogunate. Ieyasu became the shōgun, and the Tokugawa clan governed Japan from Edo Castle in the eastern city of Edo (Tokyo) along with the daimyō lords of the samurai class.

Yūrakuchō (有楽町) is a business district of Chiyoda, Tokyo, Japan, situated in between the Ginza and Hibiya Park, southeast of the Tokyo Imperial Palace. The district takes its name from Oda Nagamasu (1547–1622), who was also known as Yūraku (有楽). Oda Nagamasu built his mansion here on land granted by Tokugawa Ieyasu near the Sukiya-bashi Gate of Edo Castle. The place name dates from the Meiji period.

Yūrakuchō is served by several train and subway stations, including Hibiya Station (Toei Subway and Tokyo Metro lines) and Yūrakuchō Station (JR East and Tokyo Metro lines).

Tokugawa Ieyasu (born Matsudaira Takechiyo; January 31, 1543 – June 1, 1616) was a Japanese samurai, daimyo, and the founder and first shōgun of the Tokugawa shogunate of Japan, which ruled from 1603 until the Meiji Restoration in 1868. He was the third of the three "Great Unifiers" of Japan, along with his former lord Oda Nobunaga and fellow Oda subordinate Toyotomi Hideyoshi. The son of a minor daimyo, Ieyasu once lived as a hostage under daimyo Imagawa Yoshimoto on behalf of his father. He later succeeded as daimyo after his father's death, serving as ally, vassal, and general of the Oda clan, and building up his strength under Oda Nobunaga.

After Oda Nobunaga's death, Ieyasu was briefly a rival of Toyotomi Hideyoshi, before declaring his allegiance to Toyotomi and fighting on his behalf. Under Toyotomi, Ieyasu was relocated to the Kanto plains in eastern Japan, away from the Toyotomi power base in Osaka. He built his castle in the fishing village of Edo (now Tokyo). He became the most powerful daimyo and the most senior officer under the Toyotomi regime. Ieyasu preserved his strength during Toyotomi's failed attempts to conquer Korea. After Hideyoshi's death and the Battle of Sekigahara, Ieyasu seized power in 1600.

Ushigome (牛込) is a neighborhood in Shinjuku, Tokyo, and a former ward (牛込区 Ushigome-ku) in the now-defunct Tokyo City. The name Ushigome refers to a former cattle ranch in the area that was next to a horse ranch, Komagome (駒込). In 1947, when the 35 wards of Tokyo were reorganized into 23, it was merged with Yotsuya ward of Tokyo City and Yodobashi suburban ward of Tokyo-fu to form the modern Shinjuku ward.