Sô Sadakuni was the tenth head of the [[So clan|Sô clan]]. He held that position from [[1468]] until [[1492]]. His time saw the relocation of the clan's territory from [[Saga]] (on the island of Kyushu) to Tsushima Fuchû (Izuhara), on the island of [[Tsushima]].<ref>Plaque at Sadakuni's grave, Banshô-in.[https://www.flickr.com/photos/toranosuke/52092125802/in/photostream/]</ref>
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Sô Sadakuni was the tenth head of the [[So clan|Sô clan]]. He held that position from [[1468]] until [[1492]]. His time saw the relocation of the clan's territory from [[Saga]] (on the island of Kyushu) to Tsushima Fuchû (Izuhara), on the island of [[Tsushima]],<ref>Plaque at Sadakuni's grave, Banshô-in.[https://www.flickr.com/photos/toranosuke/52092125802/in/photostream/]</ref> as well as the end of the Sô family's status as vassals or retainers to the [[Shoni clan|Shôni clan]].
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Sadakuni was the first member of a particular branch family - overseers of Toyosaki district - to become head of the mainline of the Sô house. From [[1467]] to [[1471]], he oversaw the construction of the Nakamura yakata, a new ''[[shugo]]'' mansion at Izuhara, on Tsushima. He launched efforts to regain clan territory in [[Chikuzen province]] and secured control over the port of [[Hakata]] for a time, but was soon afterwards defeated by the [[Ouchi clan|Ôuchi clan]] (based in western Honshu), and was forced to withdraw. After this, he separated his house from the Shôni clan, marking the end of the lord-vassal relationship between the Shôni and the Sô.
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==References==
==References==
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*"The Sô clan as Rulers of Tsushima Island," gallery label, Tsushima Museum.[https://www.flickr.com/photos/toranosuke/52093121176/sizes/3k/]