Mr. Mizuno - Mizunouji

A local lord of Owari Province (Aichi Prefecture) during the Muromachi period. In the Edo period, he became a hereditary daimyo. He was a descendant of the Seiwa Genji clan and Tada Mitsumasa. The founder of the family, Shigefusa, lived in Ogawa, Akuhigo, Chita County, Owari Province, and called himself Ogawa. During the time of his son, Shigekiyo, he moved to Mizuno, Yamada-no-sho, Kasugai County, Owari Province, and changed his name to Mizuno. After 11 generations, during the time of Sadamori, a castle was built in Kariya and made it his base. His great-grandson Tadamasa was caught between the two great powers, the Oda clan of Owari and the Imagawa clan of Suruga and Totomi, and married his daughter (known as O-Dai) to Matsudaira Hirotada of Okazaki, forming an alliance with the Matsudaira clan. However, after Tadamasa's death, his son Nobumoto became a subordinate of Oda Nobunaga, and O-Dai, who had married Tadahiro, was divorced. That son later became Tokugawa Ieyasu.

After Nobumoto's death, the family was succeeded by his younger brother Tadashige, and then by another younger brother, Katsunari. In 1600 (Keicho 5), Katsunari succeeded the family, and in 1619 (Genwa 5), ​​he was given 100,000 koku in Fukuyama, Bingo (Hiroshima Prefecture), but during the time of Katsmine, the family was abolished due to lack of an heir. One of his relatives, Katsunaga, restored the family and gave him 18,000 koku in Yuki, Shimousa (Ibaraki Prefecture). The Mizuno clan split into five lineages with the Fukuyama Mizuno clan as the head family. The most famous of these is Mizuno Tadakuni, who led the Tenpo Reforms.

[Tokoro Yoshio]

Source: Shogakukan Encyclopedia Nipponica About Encyclopedia Nipponica Information | Legend

室町期の尾張国(おわりのくに)（愛知県）の国人(こくじん)。江戸期には譜代大名(ふだいだいみょう)となる。清和源氏(せいわげんじ)、多田満政(ただみつまさ)流を称す。家祖重房(しげふさ)が尾張国智多(ちた)郡英比郷(あくひごう)小河に住んで小河を称し、その子重清(しげきよ)のとき同国春日井(かすがい)郡山田庄(やまだのしょう)水野に移り、水野に改めたという。11代を経て貞守(さだもり)のとき刈屋(かりや)に城を築いて本拠とした。その曽孫(そうそん)忠政(ただまさ)は尾張の織田(おだ)氏、駿河(するが)・遠江(とおとうみ)の今川氏という二大勢力の間にあって、女子（通称お大(だい)）を岡崎の松平広忠(まつだいらひろただ)の室に嫁せしめ、松平氏と盟約したが、忠政の死後その子信元(のぶもと)は織田信長の配下となり、忠広に嫁したお大は離縁となる。その子が後の徳川家康である。

　信元の死後その家は弟の忠重(ただしげ)を経て、同じく弟の勝成(かつなり)が継ぐ。1600年（慶長5）勝成は家を継ぎ、1619年（元和5）には備後(びんご)（広島県）福山10万石となるが、勝岑(かつみね)のとき嗣(し)なく改易。一族の勝長(かつなが)が再興して下総(しもうさ)（茨城県）結城(ゆうき)1万8000石となる。水野氏はこの福山水野氏を宗家として5系に分かれた。このうちもっとも著名なのが、天保(てんぽう)改革の水野忠邦(ただくに)である。

［所理喜夫］

出典　小学館　日本大百科全書(ニッポニカ)日本大百科全書(ニッポニカ)について　情報 | 凡例