The Sô clan, based on [[Tsushima]] since the [[Kamakura period]], were the traditional intermediaries in Japan-Korea relations.
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After playing a role in [[Toyotomi Hideyoshi]]'s [[Korean Invasions]] in the 1590s, [[So Yoshitoshi|Sô Yoshitoshi]], reaffirmed as Lord of [[Tsushima han]] by the [[Tokugawa shogunate]], worked to restore relations with Korea, and eventually succeeded. Twelve official [[Korean embassies to Edo|Korean embassies]] visited Japan between [[1607]] and [[1811]]. Though only holding an official ''[[kokudaka]]'' of 100,000, the importance of the Sô clan / Tsushima han in maintaining relations with Korea was of great significance for [[Edo period]] Japan.
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In the [[Bakumatsu period]], the Sô stood in support of the shogunate, and against the ''[[sonno|sonnô]]'' ("Revere the Emperor") movement.
Members: [[So Yoshishige|Sô Yoshishige]] and [[So Yoshitoshi|Sô Yoshitoshi (Yoshitomo)]]
Members: [[So Yoshishige|Sô Yoshishige]] and [[So Yoshitoshi|Sô Yoshitoshi (Yoshitomo)]]