At first, when Yoshimura was still a child, Roju (member of shogun's council of elders), Norimune URAGAMI controlled the domestic affaires of the Akamatsu family as a guardian, but after Norimune's death, Tosho-in became the guardian of the family head, Yoshimura, as his mother-in-law, and backed by her brother, Masamoto HOSOKAWA, she gradually expanded her influence in the Akamatsu family.
当初、幼少の義村の後見人として、老臣の浦上則宗が赤松家中を牛耳っていたが、文亀2年、則宗が死ぬと、洞松院が当主義村の義母として後見となり、弟・細川政元の支援もあり、赤松家中での発言力を高めていく。