O-Ie Sōdō
On Tamenobu’s death in 1607, Nobuhira became head of the Tsugaru clan over the objections of a faction which supported his nephew Tsugaru Kumachiyo (1600–1623), the young son of Nobutake. This was the first of many "O-Ie Sōdō" internal conflicts in the Tsugaru clan during the Edo period. An "O-Ie Sōdō" placed the domain in danger of attainer, but the issue was resolved through the arbitration of the Tokugawa shogunate giving Nobuhira the title of "daimyō".