Tanaka Domain
was the 7th (and final) "daimyō" of Tanaka Domain. Masamori was the younger brother of Honda Masahiro, and became "daimyō" on his brother's death in 1860. After the Meiji restoration, he was forced to relocate from Tanaka to newly created Nagao Domain in Awa province, with the same nominal revenue of 40,000 "koku". He retired in 1870 and died in 1885.