Iino Domain (飯野藩 Iino-han) was a Japanese domain of the Edo period, located in Kazusa Province (modern-day Chiba Prefecture), Japan. It was centered on Iino Jin’ya, a fortified residence in what is now the town of Futtsu, Chiba. It was ruled for the entirety of its history by a branch of the Hoshina clan (later Matsudaira clan) of Aizu.
Iino Domain was created when a 7000 koku hatamoto, Hoshina Masasada was granted an additional 10,000 koku of territory in Settsu Province after his appointment as Justicar of Osaka in 1648. On his death, 2000 koku was given to his younger son, Hoshina Masafusa, reducing the domain to 15,000 koku. However, the domain expanded again to 20,000 koku under the tenure of Hoshina Masakage. The 10th (and final) daimyō of Iino Domain, Hoshina Masaari, served as wakadoshiyori, and played an important role as a commander in the Second Chōshū expedition. However, during the Boshin War, he switched sides to the Satchō Alliance and was later appointed to judge the guilt of those who had opposed the Meiji Restoration, including many of his relatives from the Hoshina clan of Aizu. Iino Domain became Iino Prefecture on the abolition of the han system in August 1871, and subsequently part of Kisarazu Prefecture, followed by Chiba Prefecture.
| # | Name | Tenure | Courtesy title | Court Rank | revenues |
|---|---|---|---|---|---|
| 1 | Hoshina Masasada (保科正貞) | 1648-1661 | Danjō no chū | Lower 5th (従五位下) | 17,000->15,000 koku |
| 2 | Hoshina Masakage (保科正景) | 1661-1686 | Danjō no chū | Lower 5th (従五位下) | 15,000->20,000 koku |
| 3 | Hoshina Masakata (保科正賢) | 1686-1714 | Hyōbu-sho | Lower 5th (従五位下) | 20,000 koku |
| 4 | Hoshina Masataka (保科正殷) | 1715-1718 | -none- | -none- | 20,000 koku |
| 5 | Hoshina Masahisa (保科正寿) | 1718-1739 | Danjō no chū | Lower 5th (従五位下) | 20,000 koku |
| 6 | Hoshina Masatomi (保科正富) | 1739-1770 | Echizen-no-kami | Lower 5th (従五位下) | 20,000 koku |
| 7 | Hoshina Masanori (保科正率) | 1770-1802 | Danjō no chū | Lower 5th (従五位下) | 20,000 koku |
| 8 | Hoshina Masayoshi (保科正徳) | 1802-1817 | Shimosa-no-kami | Lower 5th (従五位下) | 20,000 koku |
| 9 | Hoshina Masamoto (保科正丕) | 1817-1848 | Danjō no chū | Lower 5th (従五位下) | 20,000 koku |
| 10 | Hoshina Masaari ( 保科正益) | 1848-1871 | Danjō no chū | Lower 5th (従五位下) | 20,000 koku |