So Yoshitoshi

Sō Yoshitoshi (宗 義智^?, 1568 – 31 January 1615) was a Sō clan daimyō (feudal lord) of the island domain of Tsushima at the end of Japan's Sengoku period, and into the Edo period. His name is sometimes read as Yoshitomo. Under the influence of Konishi Yukinaga, he was baptized and accepted the name "Dario". He took part in Toyotomi Hideyoshi's invasions of Korea in the 1590s, and led a force in the Siege of Busan.

The Sō clan did not participate in the Battle of Sekigahara in 1600; however, the tozama Sō clan were allowed to continue to rule Tsushima.

Yoshitoshi was the fifth son of Sō Masamori; his wife, who took the baptismal name Maria, was the daughter of Konishi Yukinaga. Yoshitoshi became the head of the family in 1580, after his adoptive father, Sō Yoshishige, was defeated, and Tsushima conquered, in a prelude to Toyotomi Hideyoshi's Kyūshū Campaign. Yoshitoshi thus entered Hideyoshi's service and began organizing negotiations with Korea, as Hideyoshi's representative. The Joseon king refused to allow Japanese troops to pass peacefully through Korea in an attempt to conquer Ming-dynasty China, and the negotiations ultimately proved entirely fruitless, leading to Hideyoshi's decision to invade Korea militarily.

In 1587, Toyotomi Hideyoshi confirmed the Sō clan possession of Tsushima.

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