Ogasawara Sadayoshi - Ogasawara Sadayoshi

A military commander in the Azuchi-Momoyama period. He was the third son of Ogasawara Nagatoki, but became the legitimate heir. His mother was the daughter of Nishina Moriaki. Nagatoki was defeated by Takeda Shingen's invasion of Shinano, and in 1551 (Tenbun 20), both father and son fled to Uesugi Kenshin in Echigo Province. The following year, he went to Kyoto and approached the shogunate with the help of Miyoshi Nagayoshi, while Sadayoshi became a vassal of Ashikaga Yoshiaki. After Nagayoshi and Yoshiaki were defeated by Oda Nobunaga, he served Nobunaga and followed his policy towards the eastern provinces. After the Honnoji Incident in 1582 (Tensho 10), Sadayoshi invaded Shinano with the support of Tokugawa Ieyasu, recovered his former territory, entered Fukashi Castle, renamed Fukashi Matsumoto, and restored the Ogasawara clan. He later turned away from Ieyasu for a time, but when Ieyasu submitted to Toyotomi Hideyoshi in 1586, he returned to Ieyasu by Hideyoshi's orders. In 1589, he handed over the family headship to his eldest son, Hidemasa, who married the daughter of Ieyasu's eldest son, Nobuyasu, in the same year, deepening his relationship with the Tokugawa clan. When Ieyasu was transferred to the Kanto region after the Siege of Odawara the following year, Hidemasa was given a fief of 30,000 koku in Koga, Shimousa Province, and Sadayoshi also moved there and died in 1595 (4th year of Bunroku).

[Takanari Honda]

"Azuma-Toyotomi Government and Eastern Daimyo" by Toshiyuki Awano (2001, Yoshikawa Kobunkan)

Source: Shogakukan Encyclopedia Nipponica About Encyclopedia Nipponica Information | Legend

安土桃山時代の武将。小笠原長時(ながとき)の三男であるが正嫡となる。母は仁科盛明(にしなもりあき)の娘。長時は武田信玄の信濃侵攻によって敗れ、1551年（天文20）に父子ともに越後国の上杉謙信のもとへ逃れる。翌年には上洛し、三好長慶を頼り幕府にも接近、貞慶は足利義昭の家臣となる。長慶・義昭らが織田信長に敗れた後、信長に仕えてその東国政策に従った。1582年（天正10）本能寺の変後、貞慶は徳川家康の援助で信濃に侵攻、旧領を回復して深志城(ふかしじょう)に入り深志を松本と改称、小笠原家の再興を果たす。その後一時家康から離反するが、1586年に家康が豊臣秀吉に臣従すると、秀吉の命により再び家康に属した。1589年に嫡子秀政に家督を譲り、同年秀政が家康の嫡男信康の娘を娶ることによって、徳川氏との関係を深めた。翌年の小田原攻め後の家康の関東転封により、秀政は下総国(しもうさのくに)古河(こが)3万石に封じられ、貞慶もこの地に移り1595年（文禄4）に没した。

［本多隆成］

『粟野俊之著『織豊政権と東国大名』（2001・吉川弘文館）』

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