Iiyama Domain (飯山藩 Iiyama-han) was a feudal domain under the Tokugawa shogunate of Edo period Japan. It was located in northern Shinano Province, Honshū. The domain was centered at Iiyama Castle, located in what is now part of the city of Iiyama in Nagano Prefecture.
In 1603, when Matsudaira Tadateru was awarded Kawanakajima Domain, the area around Iiyama was assigned to his retainer, Minagawa Hiroteru as a 40,000 koku holding. This marked the start of Iiyama Domain. however, after Matsudaira Tadateru fell from favour with shōgun Tokugawa Ieyasu and was dispossessed, Minahawa Hiroteru suffered a similar fate and was demoted to the 10,000 koku Hitachi-Fuchū Domain. He was replaced by Hori Naoteru from a branch of the Hori clan of Echigo Province. Hori Naoteru took active steps in flood control and the opening of new rice lands to improve the domain. However, he was transferred to Nagaoka Domain in 1616. Iiyama then went to Sakuma Yasumasa, the son of one of Oda Nobunaga's famed generals, Sakuma Morimasa. The Sakuma clan ruled for three generations until the line died out without an heir in 1638. Iiyama Domain was then assigned to a branch of the Matsudaira clan, formerly from Kakegawa Domain. The Matsudaira ruled for two generations, and returned to Kakegawa in 1706. Iiyama was then assigned to Nagai Naohiro, lord of Akō Domain immediately after the famed Forty-seven rōnin incident. He remained only until 1711 when he was replaced by Toyama Yoshihide, who also stayed for only six years before he was transferred elsewhere.
In 1717, Iiyama Domain was awarded to a junior branch of the Honda clan, under whose control it remained until the Meiji Restoration. During the Boshin War, the domain was invaded by pro-Tokugawa forces from Takada Domain, who set fire to the castle town. The domain subsequently supported the imperial armies at the Battle of Hokuetsu and Battle of Aizu. In July 1871, with the abolition of the han system, Iiyama Domain briefly became Iiyama Prefecture, and was merged into the newly created Nagano Prefecture.
Bakumatsu period holdings
As with most domains in the han system, Iiyama Domain consisted of several discontinuous territories calculated to provide the assigned kokudaka, based on periodic cadastral surveys and projected agricultural yields.
List of Daimyōs
|#||Name||Tenure||Courtesy title||Court Rank||kokudaka||Notes|
|Minagawa clan (fudai) 1603–1609|
|1||Minagawa Hiroteru (皆川広照)||1603–1609||Yamashiro-no-kami (山城守)||Lower 4th (従4位下)||40,000 koku||transfer to Hitachi-Fuchū Domain|
|Hori clan (tozama) 1610–1616|
|1||Hori Naonori (堀直寄)||1610–1616||Tango-no-kami (丹後守)||Lower 5th (従五位下)||40,000 koku||transfer to Nagaoka Domain|
|Sakuma clan (tozama) 1616–1638|
|1||Sakuma Yasumasa (佐久間安政)||1616–1627||Bizen-no-kami (備前守)||Lower 5th (従五位下)||30,000 koku||transfer from Omi-Takashima Domain|
|2||Sakuma Yasunaga (佐久間安長)||1628–1632||Hyuga-no-kami (日向守)||Lower 5th (従五位下)||30,000 koku|
|3||Sakuma Yasutsugu (佐久間安次)||1632–1638||-none-||-none-||30,000 koku||died without heir|
|Matsudaira (Sakurai) clan, (fudai) 1639–1706 1639–1706 (fudai; 40,000 koku)|
|1||Matsudaira Tadatomo (松平忠倶)||1639–1696||Totomi-no-kami (遠江守)||Lower 5th (従五位下)||40,000 koku||transfer from Kakegawa Domain|
|2||Matsudaira Tadataka (松平忠喬)||1696–1706||Totomi-no-kami (遠江守)||Lower 5th (従五位下)||40,000 koku||transfer to Kakegawa Domain|
|Nagai clan (fudai) 1706–1711|
|1||Nagai Naohiro (永井直敬)||1706–1711||Iga-no-kami (伊賀守)||Lower 5th (従五位下)||33,000 koku||transfer to Iwatsuki Domain|
|Aoyama clan (fudai) 1711–1717|
|1||Aoyama Yoshihide (青山幸秀)||1711–1717||Daizen-no-suke (大膳亮)||Lower 5th (従五位下)||48,000 koku||transfer to Miyazu Domain|
|Honda clan (fudai) 1717–1871 |
|1||Honda Sukeyoshi (本多助芳)||1717–1725||Wakasa-no-kami (若狭守)||Lower 5th (従五位下)||20,000→35,000 koku||transfer from Itoigawa Domain|
|2||Honda Yasuakira (本多康明)||1725–1730||Bungo-no-kami (豊後守)||Lower 5th (従五位下)||35,000 koku|
|3||Honda Sukemochi (本多助有)||1730–1737||Ise-no-kami (伊勢守)||Lower 5th (従五位下)||35,000 koku|
|4||Honda Sukemitsu (本多助盈)||1737–1774||Sagami-no-kami (相模守)||Lower 5th (従五位下)||35,000 koku|
|5||Honda Suketsugu (本多助受)||1774–1806||Bungo-no-kami (豊後守)||Lower 5th (従五位下)||35,000 koku|
|6||Honda Suketoshi (本多助賢)||1806–1858||Bungo-no-kami (豊後守)||Lower 5th (従五位下)||35,000 koku|
|7||Honda Sukezane (本多助実)||1858–1867||Ise-no-kami (伊勢守)||Lower 5th (従五位下)||35,000 koku|
|8||Honda Sukeshige (本多助成)||1867–1868||Ise-no-kami (伊勢守)||Lower 5th (従五位下)||35,000 koku|
|9||Honda Suketaka (本多助寵)||1868–1869||- none -||- none -||35,000 koku|
|10||Honda Sukezane (本多助実)||1869–1871||Ise-no-kami (伊勢守)||Lower 5th (従五位下)||35,000 koku|
- The content of this article was largely derived from that of the corresponding article on Japanese Wikipedia.
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