Shichinohe began as one of a series of numbered fortified settlements established by the
Nanbu clan in the early
Kamakura period to control their new territories in
Nukada District of northern
Ōshū.
Shichinohe Castle was controlled by a branch of the Nanbu clan for several generations until the end of
Sengoku period, when in 1591, the Shichinohe Nanbu clan opposed the forces of
Toyotomi Hideyoshi during the
Kunohe Rebellion and were defeated. The clan survived as
hatamoto under the main lineage of the Nanbu clan at
Morioka Domain under the
Edo period Tokugawa shogunate. The
Shichinohe Domain, a subsidiary
domain of Morioka Domain was created in 1819. During the post-
Meiji restoration establishment of the modern municipalities system on 1 April 1889, Shichinohe Village was incorporated. It was elevated to town status in 1949. On 31 March 2005, the neighboring village of
Tenmabayashi was
merged into the town of Shichinohe. Shichinohe-Towada Station on the Tōhoku Shinkansen opened on 4 December 2010. This restored a rail link to the town after the closure of the
Nanbu Jūkan Railway which previously connected
Shichinohe Station with
Noheji Station on the
Tōhoku Main Line until 1997. ==Government==