Morioka Domain
was the 1st "daimyō" of Hachinohe Domain. He was the 7th son of Nanbu Toshinao, the 1st "daimyō" of Morioka Domain, and was originally named . In 1664, his elder brother, Nanbu Shigenao (the 2nd "daimyō" of Morioka Domain) died while under house arrest in Edo without an heir. The Tokugawa shogunate decided to divide the 100,000 "koku" Morioka Domain into two parts, with 20,000 "koku" forming a domain based at Hachinohe Castle under Nanbu Naofusa. His courtesy title was "Saemon-no-suke", and his Court rank was Junior Fifth Rank, Lower Grade. He died four years later at age 41 under circumstances so suspicious that the shogunate sent investigators. The investigators could find no proof that Morioka Domain was involved; and Morioka Domain strongly contended at the time that Hachinohe was not a subsidiary, but was completely independent and therefore not their responsibility.