Jōzai Domain

Jōzai Domain (請西藩, Jōzai-han^?) was a feudal domain under the Tokugawa shogunate of Edo period Japan, located in Kazusa Province (modern-day Chiba Prefecture), Japan. The domain was centered on Manube jin’ya, in what is now the city of Kisarazu, Chiba. It was ruled for the entirety of its history by a branch of the Mizuno clan. Relatively small in size, it played an important role at the end of its existence, during the Boshin War of the Meiji Restoration.

Shogun Tokugawa Ienari's attendant (osobashu) Hayashi Tadafusa was promoted from hatamoto to wakadoshiyori, or junior councilor in April 1825. Receiving an addition of 3,000 koku on top of his 7,000 koku stipend, he thus passed the 10,000 koku qualification to become a daimyō, and was assigned a small holding in Kazusa Province: Kaibuchi (貝淵藩, Kaibuchi-han^?) was created. He received an additional 3,000 koku in revenue in December 1834, and after being assigned to supervise reconstruction efforts at Edo Castle in 1839, was granted another 5,000 koku, bringing his total income up to 18,000 koku. However, on the death of Ienari, he was stripped of his position and residence and forced into retirement, with his income reduced to 10,000 koku.

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