capital, Gumma ken (prefecture), Honshu, Japan, on the Kanto Plain. An old castle town, in the Muromachi period (1338-1573) it was called Umayabashi. It was the seat of the Matsudaira family during the Tokugawa period (1603-1867). The city grew rapidly after World War II as an industrial and communications centre. It continues to produce silk yarn. Pop. (2005) 318,584.
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