Bushō and Monk
Lifespan: Tenbun 15 (1546) to 3/4 of Genna 9 (1623)
Lord: Amago Haruhisa → Amago Yoshihisa → Mōri Motonari → Mōri Terumoto
Father: Amago Haruhisa
Mother: Daughter of Amago Kunihisa
Siblings: Chitose, Yoshihisa, Tomohisa, Hidehisa, wife of Mizawa Tamekiyo, sister
Wife: [Formal] Daughter of Yamauchi Motodōri, [Second] Daughter of Tamura Hidetane, younger sister of Kumagaya Shinsaemon
Children: Motosato, Sasaki Munehisa, wife of Shinji Narikane, Tanimoto Shigehisa
In 1562, after Mōri Motonari invaded Izumo, Tomohisa was ordered by Amago Yoshihisa, his older brother, to attack Mitoya Castle and to deploy as the commanding general for reinforcements to Shiraga Castle in Izumo. Mitoya Castle served as an important base for provisioning of the Mōri during their campaign in Izumo. Mitoya Hisasuke was lord of Mitoya Castle. Formerly a retainer of Amago Haruhisa, in that same year he switched his allegiance to the Mōri along with Honjō Tsunemitsu, lord of Yamabuki Castle in Izumo. In 1566, Tomohisa supported the defense of Gassantoda Castle, protecting the entrance at Shiodaniguchi. Together with Yamanaka Yukimori, Tachihara Hisatsuna and Akiage Munenobu, the defenders fought desperately, but after their supplies and spirits ran low, Yoshihisa surrendered the castle.
After the Amago were deposed as the sengoku daimyō of Izumo, Tomohisa and his brothers, Amago Yasuhisa and Amago Hidehisa, were confined under strict supervision to the Enmyō Temple in Aki Province for the next ten years. In 1570, his captors concluded the brothers did not have animosity toward Mōri Motonari. Meanwhile, Tomohisa wed the daughter of Yamauchi Motomichi, one of Morinari’s senior retainers, receiving the favor of his new father-in-law. Once the Oda took control of the region, the brothers were released. In 1584, Tomohisa’s wife died of illness, and he then wed the daughter of Tamura Hidetane. In the role of a kakushō, or visiting commander, of the Mōri, Tomohisa participated in the deployment to the Korean Peninsula and the Battle of Sekigahara. Thereafter, Tomohisa entered the priesthood and became a monk, holding memorial services for his family and those of the Amago clan who were lost. In later years, he moved to the home of his second son, Sasaki Munehisa, with the Kuruhara of Iwami Province, renounced secular life and retired. Tomohisa died in Iwami in 1623.