Ōuchi Sadatsuna
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Ōuchi Sadatsuna(大内 定綱; 1545–1610) was a Japanese samurai and military commander of the Sengoku period. He was the lord of the Obama Castle. Sadatsuna belonged under the command of Tamura Kiyoaki. But Sadatsuna switched from the Tamura clan to the Ashina clan and he became independent of the Tamura clan. Later, he served the Date clan and became a senior retainer. He participated in the successful Kōriyama Campaign in 1588.