Koizumi Domain

The Koizumi Domain (小泉藩, Koizumi-han) was a Japanese domain during the Edo period, located within the present-day city limits of Yamato-Kōriyama, Nara. Throughout its history, it was governed by a branch of the Katagiri clan, established by Katagiri Sadataka, the younger brother of the renowned Katagiri Katsumoto. In July 1871, following the abolition of the han system, the Koizumi Domain was transformed into Koizumi Prefecture, which was eventually incorporated into Nara Prefecture.

Koizumi Domain 小泉藩
Domain of Japan
1600–1871
Reconstructed Keep of Koizumi Castle
Mon of the Katagiri clan
Capital	Koizumi Castle
Area
• Coordinates	34°37′35.56″N 135°45′25.52″E
Historical era	Edo period
• Established	1600
• Abolition of the han system	1871
Contained within
• Province	Yamato Province
Today part of	Nara Prefecture

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Location of Koizumi Domain

Koizumi Domain (Japan)

Katagiri Sadaatsu, final daimyo of Koizumi Domain

History

The Katagiri clan traces its origins to Katagiri Sadataka, younger brother of the famed Katagiri Katsumoto, renowned as one of the Seven Spears of Shizugatake. Alongside his brother, Sadataka served Toyotomi Hideyoshi, distinguishing himself in battles such as the Odawara Conquest and the Bunroku Invasion. After Hideyoshi's death, the brothers supported Tokugawa Ieyasu.

Following the Battle of Sekigahara in 1600, Tokugawa Ieyasu reassigned Sadataka to Koizumi, Yamato Province, where he established the Koizumi Domain with a stipend of 10,000 koku. However, suspicions arose about their loyalty, leading the brothers to retreat from Osaka Castle. Sadataka later became a retainer of Ieyasu and expanded his domain's stipend to 16,000 koku.

After the Siege of Osaka, Sadataka became a vassal of Ieyasu and received an increase of 6,000 koku, bringing the Koizumi domain to 16,000 koku. Under Sadataka's descendants, the domain flourished culturally. His son, Katagiri Sadamasa, excelled in the tea ceremony and architecture, further enriching the domain's legacy. Successive lords faced challenges, with some losing portions of their stipends due to various circumstances.

By the late Edo period, Koizumi Domain faced succession issues, leading to adoptions from other families to preserve the lineage. The domain's final lord, Katagiri Sadaatsu, supported the shogunate initially but later aligned with the new government during the Boshin War. After the Meiji Restoration, the domain was dissolved in 1871, and Sadaatsu's role as governor ended with the establishment of Nara Prefecture.

The Katagiri clan's history reflects a blend of military prowess, cultural patronage, and adaptation during Japan's transition from feudal domains to modern prefectures.

List of daimyo

#	Name	Tenure	Courtesy title	Court Rank	kokudaka
Katagiri clan, 1600 - 1871 (Tozama daimyo)
1	Katagiri Sadataka (片桐貞隆)	1600 - 1627	Shuzensho (修繕書)	Junior 5th Rank, Lower Grade (従五位下)	11,000 koku
2	Katagiri Sadamasa (片桐定政)	1627 - 1673	Iwami no kami (石見守)	Junior 5th Rank, Lower Grade (従五位下)	11,000 koku
3	Katagiri Sadafusa (片桐定房)	1674 - 1710	Shuzensho (修繕書)	Junior 5th Rank, Lower Grade (従五位下)	11,000 koku
4	Katagiri Sadaoki (片桐貞興)	1710 - 1741	Iwami no kami (石見守)	Junior 5th Rank, Lower Grade (従五位下)	16,000 koku
5	Katagiri Sadanari (片桐定成)	1741 - 1750	Shuzensho (修繕書)	Junior 5th Rank, Lower Grade (従五位下)	11,000 koku
6	Katagiri Sadayoshi (片桐貞義)	1750 - 1787	Iwami no kami (石見守)	Junior 5th Rank, Lower Grade (従五位下)	10,000 koku
7	Katagiri Sadaaki (貞顕片桐)	1787 - 1822	Shuzen-no-shō (主膳の庄)	Junior 5th Rank, Lower Grade (従五位下)	11,000 koku
8	Katagiri Sadanobu (定信 片桐)	1822 - 1841	Iwami no kami (石見守)	Junior 5th Rank, Lower Grade (従五位下)	16,000 koku
9	Katagiri Sadanaka (定中片桐)	1841 - 1843	Shuzen-no-shō (主膳の庄)	Junior 5th Rank, Lower Grade (従五位下)	16,000 koku
10	Katagiri Sadateru (片桐貞輝)	1843 - 1862	Iwami no kami (石見守)	Junior 5th Rank, Lower Grade (従五位下)	10,000 koku
11	Katagiri Sadatoshi (片桐貞利)	1862	-none-	Junior 5th Rank, Lower Grade (従五位下)	10,000 koku
12	Katagiri Sadaatsu (片桐貞篤)	1862 - 1871	-none-	Junior 5th Rank, Lower Grade (従五位下)	10,000 koku

See also

• List of Han
• Abolition of the han system

References

• (in Japanese) Koizumi on "Edo 300 HTML" (30 Sept. 2007)
• Papinot, E., Historical and Geographical Dictionary of Japan (Rutland and Tokyo: Charles E. Tuttle Co.,1973, 2nd printing).
• Genshoku Chadō Daijiten Japanese encyclopedia of the Way of Tea. Tokyo: Tankosha, 1992, 15th ed.
• Yahoo Japan internet encyclopedia (in Japanese), entry for Koizumi-han, at http://100.yahoo.co.jp/detail/%E5%B0%8F%E6%B3%89%E8%97%A9/