Career
He adopted the name Hoshina Chikanori (保科 近野里). Succeeding to family headship and the position of chief senior councilor in 1860, he served the 9th generation Aizu daimyo, Matsudaira Katamori. However, with Katamori"s selection for the post of Kyoto Shugoshoku in 1862, his views sharply diverged with those of his lord.
Tanomo thus spent the following six years in Aizu, informally dismissed from his position.
In 1868, with the rout at the Battle of Toba-Fushimi, and with Katamori back in Aizu for the first time in years, Tanomo"s services were again called upon. While he recommended submission to the Imperial Army early in 1868, the arrival in Aizu of former Bakufu soldiers forced Aizu"s hand in the direction of continued military action.
Once again, Tanomo"s voice was drowned out. During the Battle of Aizu, Tanomo fought in defense of the castle town of Aizu-Wakamatsu, the women of Tanomo"s family are still famous in the region for having committed mass suicide.
Just before the surrender, Tanomo escaped Aizu and headed for Sendai.
Joining Enomoto Takeaki and Hijikata Toshizō there, he continued on to Hokkaidō, where he joined in the military efforts of the Ezo Republic, but was defeated together with its forces in 1869. After spending a few years in prison, Tanomo was released in 1872, and subsequently opened up a private academy in the Izu region. In 1889, he was chosen as one of the head priests of Tōshō-gū Shrine in Nikkō, where he served alongside his former lord Matsudaira Katamori, and Katamori"s brother Matsudaira Sadaaki.
Retiring in 1899, Tanomo returned to Aizu, where he died in 1903 at the age of 74.
The book Seiun-ki (栖雲記. A Record of Cobweb-clouds), written shortly before Tanomo"s death, records his memoirs.
Saigō was portrayed by the actor Toshiyuki Nishida in the 2013 Nippon Hōsō Kyōkai taiga drama Yae no Sakura.