Okudaira family

One of the Tokugawa Fudai Daimyo. According to legend, the Akamatsu clan, descendants of Prince Tomohira, married the Kodama clan of the Musashi Shichito, and their descendants lived in Okuhira-go, Kanra County, Kozuke Province (Shimo Okuhira, Yoshii Town, Takasaki City, Gunma Prefecture) and called themselves Okuhira. Around the early Muromachi period, Sadatoshi moved from there to Sakude, Shitara County, Mikawa Province (Shinshiro City, Aichi Prefecture). During the Sengoku period, they were called the Yamaga Sanboshu along with the Suganuma clan of Nagashino and Damine in the same county, and wielded great influence. The area borders both Totomi and Shinano provinces, and Sadamasa followed the Imagawa clan, but with Sadayoshi, the Tokugawa clan temporarily switched to the Takeda clan, and in 1573 (Tensho 1), it returned to the Tokugawa clan. At this time, Tokugawa Ieyasu sent a letter of oath to Sadayoshi and Nobumasa, promising to marry Nobumasa's eldest daughter, Kamehime, in preparation for the Takeda clan. Nobumasa defended Nagashino Castle from an attack by the Takeda clan in 1575, and continued to have many military achievements after that, receiving 30,000 koku of Obata in Kozuke Province in 1590 and 100,000 koku of Kano in Mino Province in 1601 (Keicho 6). After that, his descendants were transferred several times, and during the reign of Masashige, they were fixed at 100,000 koku in Nakatsu, Buzen Province. One of Nobumasa's sons, Tadaaki, was adopted by Ieyasu, changed his surname to Matsudaira, and became a feudal lord.

[Masaki Kubota]

Source: Shogakukan Encyclopedia Nipponica About Encyclopedia Nipponica Information | Legend

徳川譜代大名(ふだいだいみょう)の一つ。伝承では具平(ともひら)親王の後裔(こうえい)赤松(あかまつ)氏が武蔵七党(むさししちとう)の児玉(こだま)氏に入婿(いりむこ)後、子孫が上野国(こうずけのくに)甘楽(かんら)郡奥平郷（群馬県高崎市吉井町下奥平）に住し奥平を称したことに始まり、室町前期ごろに貞俊(さだとし)が同地から三河国(みかわのくに)設楽(したら)郡作手(つくで)（愛知県新城(しんしろ)市）に移住したという。戦国期には同郡長篠(ながしの)・田峰(だみね)の菅沼(すがぬま)氏とともに山家三方衆(やまがさんぼうしゅう)とよばれ勢力を有した。同地域は遠江(とおとうみ)・信濃(しなの)両国に接し、貞昌(さだまさ)は今川氏に従ったが、貞能(さだよし)に至り徳川氏から一時武田氏へ、1573年（天正1）にはふたたび徳川氏に属した。このとき徳川家康は貞能(さだよし)・信昌(のぶまさ)父子に誓書を送り、長女亀姫(かめひめ)と信昌の縁組などを約し、武田氏に備えた。信昌は1575年長篠城を武田氏の攻撃から守りぬき、その後も戦功多く1590年に上野国小幡(おばた)3万石、1601年（慶長6）には美濃国(みののくに)加納(かのう)10万石を与えられた。以後子孫は数度の転封後、昌成(まさしげ)のときに豊前国(ぶぜんのくに)中津(なかつ)10万石に固定。また信昌の子のうち忠明(ただあきら)は家康の養子となり、松平と改姓し大名となった。

［久保田昌希］

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