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In 1536, he promulgated the Date provincial code (Jinkaishū).[2]
Tanemune's attempt to have Uesugi Sadazane, the childless head of the Uesugi, adopt Sanemoto and make him his heir, sparked a civil war within the Date known as the Tenbun War [ja] from 1542 to 1548 which resulted in Tanemune's replacement as clan head by his eldest son, Harumune.[3][4]
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