1894 Tokyo earthquake

Kataonami stable (片男波部屋, Kataonami-beya) is a stable of sumo wrestlers, part of the Nishonoseki ichimon or group of stables. It was founded in 1961 by former sekiwake Tamanoumi Daitarō, who branched off from Nishonoseki stable. Former sekiwake Tamanofuji took over the running of the stable upon Tamanoumi's death in 1987. In February 2010 he passed control over to another former sekiwake, Tamakasuga, remaining in the stable under the elder name Tateyama. As of January 2022 it had five active wrestlers.

Nishikido stable (Japanese: 錦戸部屋, Nishikido-beya) is a stable of sumo wrestlers, one of the Takasago group of stables. It was founded in 2002 by Mitoizumi of the Takasago stable. It was home to the only Kazakh wrestler in professional sumo, Kazafuzan, who competed in the makushita division and retired in September 2014. In 2015, the stable recruited Canadian Brodi Henderson of Victoria who competed as Homarenishiki, but he suddenly left sumo the following year. Several other wrestlers retired at the same time, leaving just five active wrestlers in the stable after July 2016. In 2017, the Mongolian Mitoryū (Turbold Baasansuren) joined as a makushita tsukedashi entrant from Nihon University, and he became the stable's first ever sekitori after the November 2017 tournament. (Another wrestler, Gokushindo, was ranked in jūryō for just one tournament in November 2018.) The retirement of Gokushindo after the May 2022 tournament left Mitoryū as the stable's only active wrestler (jonokuchi ranked Fujiizumi has not competed since September 2021).

Hakkaku stable (八角部屋, Hakkaku-beya) is a stable of sumo wrestlers, part of the Takasago ichimon or group of stables. It was established in September 1993 by former yokozuna Hokutoumi, who took with him four wrestlers from Kokonoe stable. The stable has so far produced nine sekitori, four of whom have reached the makuuchi division. As of November 2022 it had 28 wrestlers, the largest in professional sumo. Many Hakkaku wrestlers have the kanji 北勝 (pronounced hokuto or hokutō) in their ring name, taken from the former name of their head coach.

On the night of 9/10 March 1945, the United States Army Air Forces (USAAF) conducted a devastating firebombing raid on Tokyo, the Japanese capital city. This attack was code-named Operation Meetinghouse by the USAAF and is known as the Great Tokyo Air Raid in Japan. Bombs dropped from 279 Boeing B-29 Superfortress heavy bombers burned out much of eastern Tokyo. More than 90,000 and possibly over 100,000 Japanese people were killed, mostly civilians, and one million were left homeless, making it the most destructive single air attack in human history. The Japanese air and civil defenses proved largely inadequate; 14 American aircraft and 96 airmen were lost. The attack on Tokyo was an intensification of the air raids on Japan which had begun in June 1944. Prior to this operation, the USAAF had focused on a precision bombing campaign against Japanese industrial facilities. These attacks were generally unsuccessful, which contributed to the decision to shift to firebombing. The operation during the early hours of 10 March was the first major firebombing raid against a Japanese city, and the USAAF units employed significantly different tactics from those used in precision raids, including bombing by night with the aircraft flying at low altitudes. The extensive destruction caused by the raid led to these tactics becoming standard for the USAAF's B-29s until the end of the war. There has been a long-running debate over the morality of the 10 March firebombing of Tokyo. The raid is often cited as a key example in criticism of the Allies' strategic bombing campaigns, with many historians and commentators arguing that it was not acceptable for the USAAF to deliberately target civilians, and other historians stating that the USAAF had no choice but to change to area bombing tactics given that the precision bombing campaign had failed. It is generally acknowledged that the tactics used against Tokyo and in similar subsequent raids were militarily successful. The attack is commemorated at two official memorials, several neighborhood memorials, and a privately run museum.

Honjo (本所) is the name of a neighborhood in Sumida, Tokyo, and a former ward (本所区 Honjo-ku) in the now-defunct Tokyo City. In 1947, when the 35 wards of Tokyo were reorganized into 23, it was merged with the suburban Mukojima ward to form the modern Sumida ward.

Takasago stable (髙砂部屋 or 高砂部屋, Takasago-beya) is a stable of sumo wrestlers, one of the Takasago group of stables. It is correctly written in Japanese as "髙砂部屋", but the first of these kanji is rare, and is more commonly written as "高砂部屋".

The Edo-Tokyo Museum (江戸東京博物館, Edo Tōkyō Hakubutsukan) is a historical museum located at 1-4-1 Yokoami, Sumida-Ku, Tokyo in the Ryogoku district. The museum opened in March 1993 to preserve Edo's cultural heritage, and features city models of Edo and Tokyo between 1590 (just prior to the Edo period beginning) and 1964. It was the first museum built dedicated to the history of Tokyo. Some main features of the permanent exhibitions are the life-size replica of the Nihonbashi, which was the bridge leading into Edo; scale models of towns and buildings across the Edo Meiji, and Showa periods; and the Nakamuraza theatre.Designed by Kiyonori Kikutake, the building is 62.2 meters tall and covers 30,000 square meters. The concrete exterior is designed based on a traditional rice storehouse (takayuka-shiki style) and is the same height as the Edo Castle. Kikutake claimed that the building "crystallizes Japanese culture in built form," concerning the structure's traditional references but contemporary execution. There are eight floors, one below ground and seven elevated off the ground by four columns, with an open air plaza at ground level. The first floor has a museum shop, restaurants, and a ticket counter. The primary entrance is on the third floor, reached by a bright red escalator from the plaza. The fifth and sixth floors contain permanent exhibits, with temporary special and feature exhibits on the first and fifth floors. The seventh floor is a library that houses 560,000 texts and cultural items related to Edo and Tokyo.The museum opened thirteen years after the Shitamachi Museum and six years after the Fukagawa Edo Museum, all part of a national trend for building local history museums. The exhibits for all three were primarily designed by Total Media.Formerly owned and operated by the Tokyo Metropolitan Government, the Edo-Tokyo Museum is accented by the Edo-Tokyo Open Air Architectural Museum across the city in Koganei Park. The Edo-Tokyo Museum is now operated by the Tokyo Metropolitan Foundation for History and Culture.

Kokonoe stable (九重部屋, Kokonoe beya) is a stable of sumo wrestlers, one of the Takasago group of stables. It was formed in 1967 and until 2021 was located in Ishiwara, Sumida, Tokyo. As of January 2022 it had 27 sumo wrestlers, six of whom were of sekitori rank. It is the most successful stable in terms of total yūshō won by its wrestlers, with 52.

Ryōgoku Kokugikan (両国国技館), also known as Ryōgoku Sumo Hall or Kokugikan Arena, is an indoor sporting arena located in the Yokoami neighborhood (bordering to the Ryōgoku neighborhood) of Sumida, one of the 23 wards of Tokyo in Japan, next to the Edo-Tokyo Museum. It is the third building in Tokyo associated with the name kokugikan (including the Kuramae Kokugikan); the current building was opened in 1985 and has a capacity of 11,098 people.It is mainly used for sumo wrestling tournaments (honbasho) and hosts the Hatsu (new year) honbasho in January, the Natsu (summer) honbasho in May, and the Aki (autumn) honbasho in September. It also houses a museum about sumo.The venue is also used for other indoor events, such as boxing, pro wrestling, and music concerts.

Ryōgoku Station (両国駅, Ryōgoku-eki) is a railway station in Yokoami, Sumida, Tokyo, Japan, operated by East Japan Railway Company (JR East) and Tokyo Metropolitan Bureau of Transportation (Toei).

Ryōgoku (両国) is a district in Sumida, Tokyo. It is surrounded by various districts in Sumida, Chūō, and Taitō wards: Yokoami, Midori, Chitose, Higashi Nihonbashi, and Yanagibashi. In 1659, the Ryōgoku Bridge was built, spanning the Sumida River just upstream of its confluence with the Kanda River. Its name, meaning "two provinces," came from its joining Edo (the forerunner of Tokyo in Musashi Province) and Shimōsa Province. The district derived its name from that of the bridge. The Forty-seven rōnin avenged the death of their lord, Asano Naganori, by breaking into the mansion of his enemy, Kira Yoshinaka, in 1703. Part of the mansion has been preserved in a public park in Ryōgoku. Ryōgoku Station in the neighboring Yokoami district was opened in 1904, bringing rail transportation to the area. It is regarded as the heartland of professional sumo. Most training stables or heya are based there. The first Ryōgoku Kokugikan stadium for sumo was completed in 1909. The present one was built in 1985 in the Yokoami district north of Ryōgoku. Three of professional sumo's six annual official tournaments take place there.

Kise stable (木瀬部屋, Kise-beya) is a stable of sumo wrestlers, part of the Dewanoumi ichimon or group of stables. It was established in its current form in December 2003 by former maegashira and Nihon University amateur champion Higonoumi, who branched off from Mihogaseki stable. The stable's first top division wrestler was Kiyoseumi in January 2008. Its foreign recruit, Georgian Gagamaru, in May 2010 earned promotion to the top division. It is a popular destination for wrestlers with collegiate sumo experience like its stablemaster, and the retirement of Gagamaru in November 2020 opened up another spot for a foreigner.Following the demotion of Kise-oyakata (or stablemaster) in May 2010 after a scandal involving the selling of tournament tickets to members of the yakuza, Kise stable was dissolved with all 27 of its wrestlers moving to the affiliated Kitanoumi stable. Kise was allowed to reestablish the stable in April 2012. All former members, as well as newcomers Jōkōryu and Sasanoyama (now Daiseidō), joined the reconstituted stable. Jōkōryu reached the rank of komusubi in 2014, but has since fallen greatly down the ranks due to injury, and Daiseidō in September 2017 became the eleventh wrestler from Kise to reach jūryō since its founding in 2003. As of January 2022, it has 25 wrestlers, six of them are sekitori (salaried ranks). Kise stable's first makuuchi championship was delivered by Tokushōryū in the January 2020 tournament. The 33-year-old won from the bottom-most makuuchi rank of maegashira 17, after spending all but one of the previous 12 tournaments in the jūryō division.In May 2022 the stable recruited the first ever student of the University of Tokyo, an elite academic institution, to join professional sumo.