In 1542, Tanemune DATE and his son began conflicts with respect to the reigns of the family and it developed into a great uprising involving many daimyo in the Ou Region that had blood relationships (Tenbun Turbulence).
1542年には伊達稙宗父子が家督の位置付けを巡って争いを起こし、血縁関係にある奥羽諸大名を巻き込んだ大乱（天文の乱）へ発展した。