Tōshōin (洞松院, born in the 1460s) was a Japanese woman from the Sengoku period. She was the daughter of Hosokawa Katsumoto, sister of Hosokawa Masamoto, and wife of Akamatsu Masanori. Tōshōin was a de facto Daimyo who supported the Akamatsu clan as a guardian of Akamatsu Yoshimura. She took control of the clan in fact as the leader in 1521, after Yoshimura was assassinated.
- 日本人名大辞典+Plus,朝日日本歴史人物事典, デジタル版. "赤松洞松院(あかまつ どうしょういん)とは". コトバンク (in Japanese). Retrieved 2019-06-04.
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