Yunagaya Domain (湯長谷藩 Yunagaya-han) was a minor feudal domain under the Tokugawa shogunate of Edo period Japan. based in southern Mutsu Province in what is now part of modern-day Iwaki, Fukushima. It was ruled for the entirety of its history by the Naitō clan. The domain was also known as Yumoto Domain (湯本藩 Yumoto-han)
In 1622, the 70,000 koku Iwakitaira Domain was assigned to Naitō Masanaga. In 1670, his son and 2nd daimyo Naitō Tadaoki transferred 10,000 koku of newly developed rice lands to his younger son, Naitō Masasuke, creating a subsidiary domain. In 1676, Masasuke moved the location of his jin'ya from Yumoto to Yunagaya and laid out the foundations of his castle town. In 1680, as a reward to helping suppress a rebellion by Naitō Tadakatsu, the daimyo of Toba Domain, he was awarded an additional 2000 koku estate in Tamba Province. He served as castellan of Osaka Castle in 1687, and was rewarded with another 3000 koku in Kawachi Province.
The main Naitō clan in Iwakidaira were transferred to Nobeoka Domain in distant Kyushu by the shogunate due to mismanagement in 1747; however, the Naitō of Yunagaya were blessed with a succession of able rulers (almost all of whom were adopted into the clan) and able retainers. The 4th daimyo, Naitō Masaatsu, codified the domain’s laws, and the 10th daimyo, Naitō Masatami established a domain academy. In 1855, significant coal deposits were found within the domain. At the time of the Meiji restoration, the 13th daimyo, Naitō Masayasu was still an infant. The domain joined the Ōuetsu Reppan Dōmei during the Boshin War, but was captured by Imperial forces without a struggle. The domain was reduced by only 1000 koku, and Masayasu was forced to abdicate in favor of the 14th and last daimyo, Naitō Masanori in 1869. He remained a domain governor until the abolition of the han system in July 1871.
Holdings at the end of the Edo period
As with most domains in the han system, Yunagaya Domain consisted of several discontinuous territories calculated to provide the assigned kokudaka, based on periodic cadastral surveys and projected agricultural yields.
- Mutsu Province (Iwaki)
- 6 villages in Kikuta District
- 27 villages in Iwasaki District
- Tamba Province
- 2 villages in Hikami District
- 1 village in Ikaruga District
List of daimyo
# Name Tenure Courtesy title Court Rank revenues 1 Naitō Masasuke (内藤政亮) 1670–1693 Tonomo-no-kami (主殿頭) Lower 5th (従五位下) 10,000 -->15,000 koku 2 Naitō Masanori (内藤政徳) 1693–1703 Naizen-no-kami (内膳正) Lower 5th (従五位下) 15,000 koku 3 Naitō Masasada (内藤政貞) 1703–1722 Tonomo-no-kami (主殿頭) Lower 5th (従五位下) 15,000 koku 4 Naitō Masaatsu (内藤政醇) 1722–1741 Harima-no-kami Lower 5th (従五位下) 15,000 koku 5 Naitō Masanobu (内藤政業) 1741–1761 Harima-no-kami Lower 5th (従五位下) 15,000 koku 6 Naitō Sadayoshi (内藤貞幹) 1761–1778 Inaba-no-kami Lower 5th (従五位下) 15,000 koku 7 Naitō Masahiro (内藤政広) 1778–1787 -none- -none- 15,000 koku 8 Naitō Masayuki (内藤政偏) 1787–1799 Tonomo-no-kami (主殿頭) Lower 5th (従五位下) 15,000 koku 9 Naitō Masaakira (内藤政環) 1799–1824 Harima-no-kami Lower 5th (従五位下) 15,000 koku 10 Naitō Masatami (内藤政民) 1824–1855 Inaba-no-kami Lower 5th (従五位下) 15,000 koku 11 Naitō Masatsune (内藤政恒) 1855–1859 Harima-no-kami Lower 5th (従五位下) 15,000 koku 12 Naitō Masatoshi (内藤政敏) 1859–1863 Inaba-no-kami Lower 5th (従五位下) 15,000 koku 13 Naitō Masayasu (内藤政養) 1863–1868 Inaba-no-kami Lower 5th (従五位下) 15,000 koku 14 Naitō Yoshinori (内藤政憲) 1868–1871 -none- Lower 5th (従五位下) 15,000 -->14,000 koku
- Mass, Jeffrey P. and William B. Hauser. (1987). The Bakufu in Japanese History, p. 150.
- Elison, George and Bardwell L. Smith (1987). Warlords, Artists, & Commoners: Japan in the Sixteenth Century, p. 18.
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- Sasaki Suguru (2004). Boshin Sensō 戊辰戦争. Tokyo: Chuokōron-shinsha.
- "Yunagaya" at Edo 300 (in Japanese)