Izumi Domain

 was a feudal domain under the Tokugawa shogunate of Edo period Japan, located in southern Mutsu Province in what is now part of the modern-day city of Iwaki, Fukushima.
History.
In 1622, Torii Tadamasa, "daimyō" of Iwakitaira Domain was transferred to Yamagata Domain, and his place was taken by Naitō Masanaga. Masanaga transferred 20,000 "koku" of his 70,000 "koku" domain to his eldest son, Naitō Tadaoki who established a separate household. On Masanaga's death in 1634, Tadaoki inherited Iwakitaira Domain and turned his 20,000 "koku" holding over to his brother, Naitō Masaharu, who received official confirmation as a "daimyō". The marked the start of Izumi Domain. His son, Naitō Masachika ruled from 1646–1696, and also served as "wakadoshiyori" from 1690–1696. His son, Naitō Masamori was transferred to Annaka Domain in 1702.
Izumi Domain was then assigned to Itakura Shigeatsu, with a reduction in revenues to 15,000 "koku". His son, Itakura Katsukiyo served as "rōjū" and traded places with Honda Tadayuki of Sagara Domain in 1746. The Honda clan continued to rule Izumi domain through the remainder of the Edo period. Tadayuki's son, Honda Tadakazu caught the eye of "rōjū" Matsudaira Sadanari after successfully reforming the domain's finances, and was promoted to "wakadoshiyori" and "sobayonin", where he played an important role in the Kansei Reforms. As a reward for his efforts, his revenues were increased by 5000 "koku". The 5th "daimyō" of Izumi, Honda Tadanori established the domain's academy in an effort to modernize the domain in the Bakumatsu period. Honda Tadatoshi served as "jisha-bugyō" and led the domain in support of the Tokugawa during the Boshin War. Following the Meiji restoration, he was punished for his support of the Ōuetsu Reppan Dōmei by a reduction in income of 2000 "koku", and was forced to resign in favor of his adopted son Honda Tadanobu, who served as imperial governor until the abolition of the han system in 1871.
Holdings at the end of the Edo period.
As with most domains in the han system, Izumi Domain consisted of several discontinuous territories calculated to provide the assigned "kokudaka", based on periodic cadastral surveys and projected agricultural yields.
List of daimyō.
Honda Tadayuki.
 was the 3rd "daimyō" of Sagara Domain in Tōtōmi Province and the first Honda "daimyō" of Izumi Domain in Mutsu Province. His wife was a daughter of Matura Atsunobu of Hirado Domain. His courtesy title was "Etchū-no-kami" and he held lower 5th court rank. He was the third son of Honda Tadanao, "daimyō" of Yamato-Kōriyama Domain and was posthumously adopted to succeed Tadanao's elder brother Honda Tadamichi as "daimyō" of Sagara in 1721. In 1746, the Tokugawa shogunate relocated the clan to Izumi Domain in southern Mutsu Province. In 1754, he retired in favor of his son, Honda Tadakazu. He died in 1773. His grave is at the temple of Rinshō-in in Bunkyō-ku, Tokyo.
Honda Tadakazu.
 was the 2nd Honda "daimyō" of Izumi Domain. He was the eldest son of Honda Tadayuki and was born at the domain's residence in Edo. His wife was a daughter of Matsura Sanenobu of Hirado Domain. In 1754, on the retirement of his father, he became "daimyō". In 1787, he was promoted to "wakadoshiyori" within the shogunate administration, and "sobayōnin" the following year. In 1790, his position rose to "rōjū-kaku", and together with Matsudaira Sadanobu and Matsudaira Nobuakira, he is regarded as one of the central figures of the Kansei period. In 1790, the "kokudaka" of the domain was also increased by 5000 "koku" and he received permission to be styled as “castellan”, even though the domain did not have a castle. He was a noted scholar of economics, and a proponent of the "Shingaku" movement. he is noted for establishing grain stores in each village as insurance against famine, and for banning abortion in his domain. He was instrumental to the shogunate's Kansei Reforms and also strongly pushed for increasing Japan's defences against the southward expansion of the Russian Empire, which threatened Ezo. He resigned his posts in 1798, and retired as "daimyō" in 1800 and died in 1812.
Honda Tadashige.
 was the 3rd Honda "daimyō" of Izumi Domain. He was the older brother of Honda Tadakazu, but as his mother was a concubine, he was bypassed in the succession by his legitimate younger brother, Honda Tadao. However, Tadao was disinherited in 1785, and Tadashige became "daimyō" on the retirement on Honda Tadakazu in 1800. His wife was a daughter of Itakura Katsutoshi of Annaka Domain. He continued the fiscal policies of his father. He retired in 1815, and died in 1832.
Honda Tadatomo.
 was the 4th "daimyō" of Izumi Domain. He was the eldest son of Honda Tadashige, and became "daimyō" in 1815 on the retirement of his father. His wife was a daughter of Yanagihara Masaatsu of Takada Domain. In 1836, he retired, turning the domain over to his 3rd son, Honda Tadanori. He died in 1839, and his grave is at the temple of Kōfuku-ji in Mukojima, Sumida, Tokyo.
Honda Tadanori.
 was the 5th "daimyō" of Izumi Domain, He was the third son of Honda Tadatomo, and his wife was a daughter of Yanagisawa Yasuhiro of Yamato-Kōriyama Domain. He became "daimyō" on the retirement of his father in 1836. He built the han school. He served as a "wakadoshiyori" from 1841–1860 under Shōgun Tokugawa Ieyoshi. He died in Edo in 1860 at age 43 without heir.
Honda Tadatoshi.
 was the 6th "daimyō" of Izumi Domain. He was the 4th son of Honda Tadatomo. His wife was a daughter of Hori Naotada of Suzaka Domain. He was posthumously adopted on the death of his older brother, Honda Tadanori in 1860, and was received in formal audience by Shōgun Tokugawa Ieshige. In 1863, he became "jisha-bugyō" and the same year was also appointed "sōshaban". In 1864, he advanced to the post of "wakadoshiyori", but was dismissed only five months later. In 1866, he again became "wakadoshiyori", but again resigned after ten months. In 1868, with the start of the Boshin War, he favored the imperial cause, but was pressured into joining the pro-Tokugawa Ōuetsu Reppan Dōmei instead. As a result, the domain was invaded by the forces of the Satchō Alliance and Izumi "jin’ya" was burned during the Battle of Iwaki. Tadatoshi was forced to flee to Sendai. A few months later he surrendered to the Meiji government and was placed under house arrest, with the domain reduced in "kokudaka" by 2000 "koku" He was released from house arrest]in 1870 and his court rank restored. He died in 1883 and his grave is at the temple of Kōfuku-ji in Mukojima, Sumida, Tokyo.
Honda Tadanobu.
 was the 7th and final "daimyō" of Izumi Domain. As his predecessor, Honda Tadatoshi had been forced into retirement by the Meiji government over his involvement in the Boshin War. He was selected as heir by the Honda clan in 1868. From 1869, he became imperial governor until the abolition of the han system in 1871. He died in 1903, and his grave is at the temple of Kōfuku-ji in Mukojima, Sumida, Tokyo.