The feudal lord and defender of Suruga, Yoshimoto left home as a young boy. Unrest broke out when his older brother was killed. Yoshimoto spent some contemplative time as a monk, but returned to secular life, whereupon he slew his mother and brother-in-law. His relations with the Hojo clan worsened when he married Nobutora Takeda’s daughter. He repelled the Hojo, and wrested control of a wide area including Suruga, Totomi, and Mikawa. Later, Imagawa established a three-way alliance with Takeda and Hojo, and set out toward the capital with Ieyasu Tokugawa. However, they were defeated in a surprise attack by Nobunaga Oda at Okehazama."