The Japanese city of Hiroshima is the capital of Hiroshima Prefecture, and the largest city in the Chugoku region of western Honshu, the largest of Japan’s islands. It is known throughout the world as the first city in history subjected to nuclear warfare when it was bombed by the United States of America on August 6, 1945 during World War II. Hiroshima gained municipality status on April 1, 1889 and was designated on April 1, 1980 by government ordinance. The city's current mayor is Tadatoshi Akiba who assumed the office on February 23, 1999. Hiroshima was founded on the coast of the Seto Inland Sea in 1589 by Mori Terumoto, who made it his capital after leaving Koriyama Castle in Aki Province. Hiroshima Castle was quickly built, and Terumoto moved in in 1593. Terumoto was on the losing side at the Battle of Sekigahara. The winner, Tokugawa Ieyasu, deprived Mori Terumoto of most of his fiefs including Hiroshima and gave Aki province to Masanori Fukushima, a daimyo who had supported Tokugawa. The castle passed to Asano Nagaakira in 1619, and Asano was appointed the daimyo of this area. Under Asano rule, the city prospered, developed, and expanded, with few military conflicts or disturbances. Asano's descendants continued to rule until the Meiji Restoration in the 19th century.