Ichinomiya Domain

Ichinomiya Domain (一宮藩, Ichinomiya-han^?) was a feudal domain under the Tokugawa shogunate of Edo period Japan, located in Kazusa Province (modern-day Chiba Prefecture), Japan. It was centered on Ichinomiya jin'ya in what is now the town of Ichinomiya, Chiba.

Ichinomiya Castle was a mountain-top fortification built by the Satomi clan, rulers of most of the Bōsō Peninsula during the Sengoku period as protection for their northern holdings in eastern Kazusa Province . Following the Battle of Odawara in 1590, the Kantō region was assigned to Tokugawa Ieyasu by the warlord Toyotomi Hideyoshi, who also restricted the Satomi to Awa Province for their lukewarm support of his campaigns against the Late Hōjō clan. Tokugawa Ieyasu appointed Honda Tadakatsu, one of his hereditary retainers, to be daimyō of the new 100,000 koku Otaki Domain, and the old fortifications at Ichinomiya were abandoned.

Otaki Domain was subsequently reduced in size, with large portions becoming tenryō territory directly under the control of the Tokugawa shogunate or assigned as exclaves of other domains. Ichinomiya became an exclave of Hatsuta Domain of Kii Province, ruled by the Kanō clan.

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