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Tsuruga Castle, located in Aizuwakamatsu
Aizu comprises the western third of Fukushima Prefecture
Aizu comprises the western third of Fukushima Prefecture
 o Total5,420.69 km2 (2,092.94 sq mi)
(1 October 2017[1])
 o Total270,648
 o Density50/km2 (130/sq mi)

Aizu () is the westernmost of the three regions of Fukushima Prefecture, Japan, the other two regions being Nakad?ri in the central area of the prefecture and Hamad?ri in the east. As of October 1, 2010, it had a population of 291,838.[2] The principal city of the area is Aizuwakamatsu.

During the Edo period, Aizu was a feudal domain known as Aizu Domain (, Aizu-han).[3] It was part of Mutsu Province; the area once was part of Iwase Province in the 8th century and, before the prefectural system, Iwashiro Province. Although never an official province in its own right, Aizu was considered as such de facto, and even today local Japan Rail stations prefix "Aizu-" to names instead of "Iwashiro-", as it was for stations around the center of Fukushima Prefecture. The only other domain to hold this privilege is Tsugaru Domain in western Mutsu Province (Aomori Prefecture).


Aizu troops disembarking at Fushimi before the Battle of Toba-Fushimi
Monument to the Byakkotai Samurai

The daimy? over much of the Edo period was from the Hoshina family. They had been senior retainers of the Takeda family, and in the early 17th century the head of the family, Hoshina Masamitsu, adopted the illegitimate son of the second Tokugawa sh?gun Hidetada. As a result, the Hoshina family's fortunes rose, with larger and larger fiefs being given to them, until finally they were moved to Aizu, then rated at 240,000 koku, in the mid-17th century. Hoshina Masayuki, the adopted head of the family, rose in prominence while his half-brother Tokugawa Iemitsu was shogun, and later acted as a regent for his successor, the underage fourth shogun Tokugawa Ietsuna. By the end of the 17th century, the Hoshina family was allowed the use of the Tokugawa hollyhock crest and the Matsudaira surname, and from then on was known as the Aizu-Matsudaira clan, with the name Hoshina being used mainly for internal documents.

In 1822, the Hoshina-Matsudaira line became extinct with the death of the seventh lord Katahiro, at the age of only 15. He was succeeded by the eighth lord Katataka, who was a sixth cousin (twice removed) and a member of the Takasu cadet branch of the Mito collateral line. He died without heirs in 1852 and was succeeded by his grandnephew, the famous Katamori, whose descendants have since headed the family. The present head of the Tokugawa clan, Tsunenari, is also from the Aizu lineage.

In the house code set down by Masayuki, there was a specific injunction to serve the shogun with single-minded devotion, and it was this injunction which the family took great pains to show its adherence to, even if its true objectives were those of improving status and prestige.

Aizu was known for its martial skill, and maintained a standing army of over 5000. It was often deployed to security operations on the northern fringes of the country, as far north as southern Sakhalin. Also, around the time of Commodore Perry's arrival, Aizu had a presence in security operations around Edo Bay.

The domain's two sets of formal rules for its army, the Rules for Commanders (? sh?ch? kinrei) and Rules for Soldiers (? shisotsu kinrei), written in the 1790s, laid down a professional, modern standard for military conduct and operations, including the following two items in the Rules for Soldiers which codified the human rights and protection of enemy noncombatants, over 70 years before the first Geneva Convention of 1864:

Emblem of Aizu domain's infantry at end of Edo period

"Regardless of whether it belongs to the enemy, trampling and ruining rice fields is forbidden."

"In enemy territory, it is forbidden to rape women, harm the elderly and children, desecrate graves, torch the homes of commoners, slaughter livestock needlessly, pillage money and rice, cut trees without reason, and steal crops in the field."

During the tenure of the ninth generation lord Matsudaira Katamori, the domain deployed massive amounts of their troops to Kyoto, where Katamori served as Kyoto Shugoshoku. Operating under the orders of the Shogunate, they also acted as the first official supervisor and patron of the Shinsengumi. Earning the enmity of the Ch?sh? Domain, and alienating his ally, the Satsuma Domain, Katamori retreated with the shogun Tokugawa Yoshinobu in 1868. Though the Satsuma-Ch?sh? controlled Imperial Court, following Yoshinobu's resignation, called for the punishment of Katamori and Aizu as "enemies of the Court," he took great pains to beg for mercy, finally acquiescing to calls for war later in 1868, during the Boshin War. Though the Aizu forces fought as part of the greater efforts of the ?uetsu Reppan D?mei, they were eventually besieged at Tsuruga Castle, the seat of the Aizu domain, in October 1868.

The Byakkotai ("White Tiger Force"), a group of young, predominantly teenage, samurai, committed seppuku (a form of ritual suicide) on a hillside overlooking the castle after seeing its defences breached.

Notable people

  • Dewa Shiget? (1856-1930), an admiral of the Imperial Japanese Navy, elevated to the peerage with the title of danshaku (baron).
  • Hideyo Noguchi (1876-1928), a doctor who made considerable contributions to the fight against syphilis and yellow fever.
  • Shiba Gor? (1860-1945), prominent at the Siege of the Peking legations, 1900.
  • Niijima Yae (born: Yamamoto Yaeko, 1845-1932), female warrior, co-founder of Doshisha University, instructor in the women's division of Doshisha and wife of Niijima Jo (Joseph Hardy Neesima), nurse, tea master
  • Matsudaira Teru (1832 - 1884), female warrior, she was an aristocrat during the late Edo, she participated in the siege of Aizuwakamatsu Castle.
  • Yamamoto Kakuma (1828-1892), former samurai, co-founder of Doshisha University.
  • Takamine Hideo (1854-1910), former samurai, graduate of Oswego Normal School in New York State, Meiji-era educator and head of the Tokyo Normal School, Tokyo Art School, Tokyo Women's Normal School and Tokyo Music School. He is best known for introducing Pestallozian teaching methods to Japan and educational reform.
  • Ibuka Kajinosuke (1854-1935), former samurai turned Christian pastor, responsible for bringing the YMCA to Japan.
  • Matsudaira Tsuneo (1877-1949), son of Matsudaira Katamori, ambassador to the U.S. and UK.
  • Matsudaira Setsuko (1909-1995), daughter of Matsudaira Tsuneo; later married Prince Chichibu no Miya, Emperor Hirohito's brother.
  • Yamakawa Kenjir? (1854-1931), graduate of Yale University, physicist, researcher, academic administrator, President of Tokyo University and Kyoto University
  • Yamakawa Sutematsu (1860-1919) graduate of Vassar College, after marriage to Oyama Iwao, she is known as Oyama Sutematsu, an organizer at the Rokumeikan, supporter of numerous organizations such as the Red-Cross in Japan and Women's Patriotic Society. She assisted in the founding of Tsuda College (which was organized by her close lifelong friend Tsuda Umeko)
  • Yamakawa Hiroshi (1845-1898) Brother of Kenjiro and Sutematsu, a notable military leader who defended the domain, later organized Aizu refugees, a key figure in the relief of Kumamoto Garrison during the Seinan War or Satsuma Rebellion and General in the Meiji Era
  • Yamakawa Futaba (1844-1909), a co-worker of Takamine Hideo, head administrator at the Tokyo Women's Normal School, she is best known for her support of women's education
  • Tokugawa Tsunenari (1940- ), grandson of Matsudaira Tsuneo; current head of the main Tokugawa family.
  • Saig? Tanomo (1830-1903), former chief councilor of the Aizu clan; later, a teacher of S?kaku Takeda and a chief priest of the T?sh?g? Shrine.
  • S?kaku Takeda, a famous martial artist of Daito Ryu.
  • Akabane Shir? (?) (1855-1910), Japanese ambassador to Holland.
  • Akazuka Takemori (?) (1852-1879), Meiji-era police official.[4]
  • Uryu Iwako (1829-1897), prominent social worker.
  • Suwa Kichiko (1819-1907), philanthropist.
  • Y?ki Kunitari (1800-1888), poet.
  • Isao Matsudaira (?) (1907-2006), grandson of Katamori, politician, governor of Fukushima Prefecture (1976-1988).
  • Akizuki Teijir? (1824-1900), Aizu samurai, educator.
  • Kiyoshi Sait? (1907-1997), s?saku-hanga artist.
  • Nakano Takeko (1847-1868), female warrior.
  • Kei Sat? (1928-2010), film actor

List of daimy?s

Name Tenure
Gam? Ujisato (?) 1590-1595
Gam? Hideyuki (?) 1595-1598
Name Tenure
Uesugi Kagekatsu (?) 1598-1601
Name Tenure
Gam? Hideyuki (?) 1601-1612
Gam? Tadasato (?) 1612-1627
Name Tenure
Kat? Yoshiaki (?) 1627-1631
Kat? Akinari (?) 1631-1643
Name Tenure
Hoshina Masayuki (?) 1643-1669
Hoshina Masatsune (?) 1669-1681
Matsudaira Masakata (?) 1681-1731
Matsudaira Katasada (?) 1731-1750
Matsudaira Katanobu (?) 1750-1805
Matsudaira Kataoki (?) 1805
Matsudaira Katahiro (?) 1806-1822
Matsudaira Katataka (?) 1822-1852
Matsudaira Katamori (?) 1852-1868
Matsudaira Nobunori (?) 1868-1891

Genealogy (Hoshina-Matsudaira line)

  • Tokugawa family crest.svg Tokugawa Ieyasu, 1st Tokugawa Sh?gun (1543-1616; r. 1603-1605)
    • Tokugawa family crest.svg Tokugawa Hidetada, 2nd Tokugawa Sh?gun (1579-1632; r. 1605-1623)
      • Simple silver crown.svg I. Hoshina Masayuki, 1st Lord of Aizu (cr. 1643) (1611-1673; r. 1643-1669)
        • Simple silver crown.svg II. Hoshina Masatsune, 2nd Lord of Aizu (1647-1681; r. 1669-1681)
        • Simple silver crown.svg III. Matsudaira Masakata, 3rd Lord of Aizu (1669-1731; r. 1681-1731)
          • Simple silver crown.svg IV. Katasada, 4th Lord of Aizu (1724-1750; r. 1731-1750)
            • Simple silver crown.svg V. Katanobu, 5th Lord of Aizu (1744-1805; r. 1750-1805)
          • Hirofumi
            • Kataaki (1750-1785)
              • Simple silver crown.svg VI. Kataoki, 6th Lord of Aizu (1779-1806; r. 1805)
                • Simple silver crown.svg VII. Katahiro, 7th Lord of Aizu (1803-1822; r. 1806-1822)
    • Tokugawa Yorifusa, 1st Lord of Mito (1603-1661)
      • Yorishige, 1st Lord of Takamatsu (1622-1695)
        • Yoritoshi (1661-1687)
          • Yoritoyo, 3rd Lord of Takamatsu (1680-1735)
            • Tokugawa Munetaka, 4th Lord of Mito (1705-1730)
              • Tokugawa Munemoto, 5th Lord of Mito (1728-1766)
                • Tokugawa Harumori, 6th Lord of Mito (1751-1805)
                  • Tokugawa Harutoshi, 7th Lord of Mito (1773-1816)
                    • Tokugawa Nariaki, 9th Lord of Mito (1800-1860)
                      • Simple silver crown.svg X. Nobunori, 10th Lord of Aizu, 10th family head, Viscount (1855-1891; Lord: 1868; Viscount: cr. 1884)
                  • Yoshikazu, 9th Lord of Takasu (1776-1832)
                    • Yoshitatsu, 10th Lord of Takasu (1800-1862)
                      • Simple silver crown.svg IX. Katamori, 9th Lord of Aizu (1836-1893; r. 1852-1868)
                        • Kataharu, 11th family head, 1st Viscount (1869-1910; 11th family head: 1869-1910; Viscount: cr. 1884)
                        • Rear-Admiral Morio, 12th family head, 2nd Viscount (1878-1944; 12th family head and 2nd Viscount: 1910-1944)
                          • Moritei, 13th family head, 3rd Viscount (1926-2011; 13th family head: 1944-2011; 3rd Viscount: 1944-1947)
                            • Yasuhisa, 14th family head (b. 1954; 14th family head: 2011- )
                    • Simple silver crown.svg VIII. Katataka, 8th Lord of Aizu (1806-1852; r. 1822-1852)


See also


Map of Japan, 1789 - the Han system affected cartography
  1. ^ "". Fukushima Prefecture. Retrieved 2017.
  2. ^ ? (27 December 2010). 22?-?- (in Japanese). Fukushima Prefecture. Archived from the original on 30 May 2012. Retrieved 2012.
  3. ^ Deal, William E. (2005). Handbook to Life in Medieval and Early Modern Japan, p. 81.
  4. ^ "". Archived from the original on 2016-03-03. Retrieved .
  5. ^ Genealogy (jp)


  • Noguchi Shinichi, Aizu-han. Tokyo: Gendai Shokan, 2005. (ISBN 4-7684-7102-1)
  • Bolitho, Harold. "Aizu, 1853-1868." Proceedings of the British Association for Japanese Studies, vol. 2 (1977): 1-17.

External links

Media related to Aizu Clan Parade at Wikimedia Commons

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