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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.

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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