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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.

Yoshitoshi later worked to restore normal relations with Korea. He eventually succeeded, with an official [[Korean embassies to Edo|Korean embassy]] first arriving in [[1607]].

Yoshitoshi later worked to restore 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>

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''.

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