お家騒動
The early years of the Edo era were marked by a series of major "O-Ie Sōdō" disturbances over the succession to the clan chieftainship. Tsugaru Nobuhira's accession was disputed by supporters of the son of Tsugaru Nobutake in the of 1607. Further troubles arose in the of 1612, the of 1634, and the of 1647.