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Yoshitoshi was the 19th head of the [[So clan|Sô clan]] and the first [[Edo period]] lord of [[Tsushima han]]. The fourth son of [[So Masamori|Sô Masamori]], he was a son-in-law of [[Konishi Yukinaga]] and succeeded to become head of the Sô house in [[1588]]. Yoshitoshi served in the [[Korean Invasions]] under Yukinaga and later sided with [[Tokugawa Ieyasu]] during the [[Sekigahara Campaign]] ([[1600]]), though he took no part in the fighting at Sekigahara.

Yoshitoshi was the 19th head of the [[So clan|Sô clan]] and the first [[Edo period]] lord of [[Tsushima han]]. The fourth son of [[So Masamori|Sô Masamori]], he was a son-in-law of [[Konishi Yukinaga]] and succeeded to become head of the Sô house in [[1588]]. Yoshitoshi served in the [[Korean Invasions]] under Yukinaga and later sided with [[Tokugawa Ieyasu]] during the [[Sekigahara Campaign]] ([[1600]]), though he took no part in the fighting at Sekigahara.

In [[1586]], in response to attacks by ships from [[Iki Island]] against Yarikawa in Nii district, Yoshitoshi launched retaliatory attacks on Iki and [[Hirado]]. The following year, after receiving orders from [[Toyotomi Hideyoshi]] related to attacking Korea, Yoshitoshi attempted (along with [[So Yoshishige (1532-1588)|Sô Yoshishige]]) to negotiate a diplomatic solution with the [[Joseon]] court; ultimately this was unsuccessful, however.

In [[1586]], in response to attacks by ships from [[Iki Island]] against Yarikawa in Nii district, Yoshitoshi launched retaliatory attacks on Iki and [[Hirado]]. The following year, after receiving orders from [[Toyotomi Hideyoshi]] related to attacking Korea, Yoshitoshi attempted (along with [[So Yoshishige (1532-1588)|Sô Yoshishige]]) to negotiate a diplomatic solution with the [[Joseon]] court; ultimately this was unsuccessful, however. In [[1591]], Yoshitoshi oversaw the construction of [[Shimizusan castle]]. In [[1600]], he participated in the [[Sekigahara Campaign]] on the side of [[Ishida Mitsunari]] but was nevertheless able to maintain his territory.

Yoshitoshi later worked with his ''[[karo|karô]]'' [[Yanagawa Shigenobu]] and others to negotiate the restoration of normal relations with Korea. He eventually succeeded, with an official [[Korean embassies to Edo|Korean embassy]] first arriving in [[1607]], and the [[Kiyu Treaty|Kiyû Treaty]] being concluded two years later. Following this, the [[Tokugawa shogunate]] affirmed the Sô clan's sole (monopoly) rights on Japanese diplomatic and trade relations with Korea.<ref name=statue>Explanatory plaque on Sô Yoshitoshi statue, Izuhara, Tsushima.</ref>

Yoshitoshi later worked with his ''[[karo|karô]]'' [[Yanagawa Shigenobu]] and others to negotiate the restoration of normal relations with Korea, sending envoys to Korea in [[1602]]. He eventually succeeded, with an official [[Korean embassies to Edo|Korean embassy]] first arriving in [[1607]], and the [[Kiyu Treaty|Kiyû Treaty]] being concluded two years later. Following this, the [[Tokugawa shogunate]] affirmed the Sô clan's sole (monopoly) rights on Japanese diplomatic and trade relations with Korea.<ref name=statue>Explanatory plaque on Sô Yoshitoshi statue, Izuhara, Tsushima.</ref>

Upon his death in [[1615]], his son [[So Yoshinari|Sô Yoshinari]] became ''daimyô''.

Upon his death in [[1615]], his son [[So Yoshinari|Sô Yoshinari]] became ''daimyô''.