Sô Yoshinari was the 20th head of the Sô clan and the second Edo period lord of Tsushima han. He is perhaps most known for the Yanagawa Affair, which took place during his time as lord. He also escorted five Korean embassies to Edo, in 1617, 1624, 1636, 1643, and 1655.
In 1635, Tsushima domain Karô Yanagawa Shigeoki accused the Sô clan of falsifying formal diplomatic communications with the Korean royal court. This eventually resulted in Yoshinari, Shigeoki, and others being received in audience by Shogun Tokugawa Iemitsu, in Edo castle, with Iemitsu considering the accusations directly. In the end, the shogunate allowed the Sô house to retain their lordship over Tsushima and their unique privileges and responsibilities in handling relations with Korea; Shigeoki was exiled to Tsugaru.
|Lord of Tsushima han
- Plaques on-site at Sô clan cemetery, Banshô-in temple, Tsushima.