toːkjoː, ˈtoʊki.oʊ; officially , is one of the 47 prefectures
Prefectures of Japan
The prefectures of Japan are the country's 47 subnational jurisdictions: one "metropolis" , Tokyo; one "circuit" , Hokkaidō; two urban prefectures , Osaka and Kyoto; and 43 other prefectures . In Japanese, they are commonly referred to as...

 of Japan
Japan is an island nation in East Asia. Located in the Pacific Ocean, it lies to the east of the Sea of Japan, China, North Korea, South Korea and Russia, stretching from the Sea of Okhotsk in the north to the East China Sea and Taiwan in the south...

. Tokyo is the capital of Japan
Capital of Japan
The capital of Japan, where the seat of the Government of Japan and home of the Emperor are located, is de facto. While this is generally not in dispute, the capital de jure is unclear. There is a dispute as to exactly when Tokyo became the capital. Some state that it occurred when Tokyo...

, the center of the Greater Tokyo Area
Greater Tokyo Area
The Greater Tokyo Area is a large metropolitan area in Kantō region, Japan, consisting of most of the prefectures of Chiba, Kanagawa, Saitama, and Tokyo . In Japanese, it is referred to by various terms, including the , , and others....

, and the largest metropolitan area of Japan. It is the seat of the Japanese government
Government of Japan
The government of Japan is a constitutional monarchy where the power of the Emperor is very limited. As a ceremonial figurehead, he is defined by the 1947 constitution as "the symbol of the state and of the unity of the people". Power is held chiefly by the Prime Minister of Japan and other elected...

 and the Imperial Palace
is the main residence of the Emperor of Japan. It is a large park-like area located in the Chiyoda area of Tokyo close to Tokyo Station and contains several buildings including the main palace , the emperor left Kyoto Imperial Palace for Tokyo...

, and the home of the Japanese Imperial Family
Imperial House of Japan
The , also referred to as the Imperial Family or the Yamato Dynasty, comprises those members of the extended family of the reigning Emperor of Japan who undertake official and public duties. Under the present Constitution of Japan, the emperor is the symbol of the state and unity of the people...

. Tokyo is located in the Kantō region
Kanto region
The is a geographical area of Honshu, the largest island of Japan. The region includes the Greater Tokyo Area and encompasses seven prefectures: Gunma, Tochigi, Ibaraki, Saitama, Tokyo, Chiba, and Kanagawa. Within its boundaries, slightly more than 40 percent of the land area is the Kantō Plain....

 on the southeastern side of the main island Honshu
is the largest island of Japan. The nation's main island, it is south of Hokkaido across the Tsugaru Strait, north of Shikoku across the Inland Sea, and northeast of Kyushu across the Kanmon Strait...

 and includes the Izu Islands
Izu Islands
The are a group of volcanic islands stretching south and east from the Izu Peninsula of Honshū, Japan. Administratively, they form two towns and six villages; all part of Tokyo. The largest is Izu Ōshima, usually called simply Ōshima....

 and Ogasawara Islands
Ogasawara Islands
The Bonin Islands, known in Japan as the are an archipelago of over 30 subtropical and tropical islands, some directly south of Tokyo, Japan. Administratively, they are part of Ogasawara Municipality of Ogasawara Subprefecture, Tokyo...

. Tokyo Metropolis was formed in 1943 from the merger of the former and the .

The Tokyo Metropolitan government administers the twenty-three special wards of Tokyo
Special wards of Tokyo
The are 23 municipalities that together make up the core and the most populous part of Tokyo, Japan. Together, they occupy the land that was the city of Tokyo before it was abolished in 1943. The special wards' structure was established under the Japanese Local Autonomy Law and is unique to...

 (each governed as a city), which cover the area that was the city of Tokyo, as well as 39 municipalities
Municipalities of Japan
Japan has three levels of government: national, prefectural, and municipal. The nation is divided into 47 prefectures. Each prefecture consists of numerous municipalities. There are four types of municipalities in Japan: cities, towns, villages and special wards...

 in the western part of the prefecture and the two outlying island chains.

1703    In Edo (now Tokyo), 46 of the Forty-seven Ronin commit seppuku (ritual suicide) as recompense for avenging their master's death.

1857    An earthquake in Tokyo, Japan kills over 100,000.

1909    Mayor of Tokyo Yukio Ozaki presents Washington, D.C. with 2,000 cherry trees, which President Taft decides to plant near the Potomac River.

1921    Japanese Prime Minister Hara Takashi is assassinated in Tokyo.

1923    The Great Kantō earthquake devastates Tokyo and Yokohama, killing about 105,000 people.

1934    "Fujifilm", the foundation of Fujifilm, the photographic and electronic industry in "Tokyo", "Japan".

1936    Sada Abe is arrested after wandering the streets of Tokyo for days with her dead lover's severed genitals in her hand. Her story soon becomes one of Japan's most notorious scandals.

1942    World War II: The Doolittle Raid on Japan. Tokyo, Yokohama, Kobe and Nagoya bombed.

1943    Tokyo City merges with Tokyo Prefecture and is dissolved. Since then, no city in Japan has had the name "Tokyo" (present-day Tokyo is not officially a city).

1945    General Douglas MacArthur moves his command headquarters to Tokyo.