Okutono Domain (奥殿藩 Okutono-han), also known as Okudono, was a feudal domain under the Tokugawa shogunate of Edo period Japan, located in Kamo District and Nukata Districts of Mikawa Province (part of modern Aichi Prefecture), and in Saku District, Shinano Province, (part of modern Nagano Prefecture) Japan. The domain was also known as Ogyū Domain (大給藩 Ogyū-han) and later known as Tanoguchi Domain (田野口藩 Tanoguchi-han) and Tatsuoka Domain (龍岡藩 Tatsuoka-han). The ruling family was the Ogyū-Matsudaira clan.
The Ogyū clan was a cadet branch of the Matsudaira clan based in northern Mikawa Province, and were hereditary vassals of the Tokugawa clan. Matsudaira Masatsugu was awarded a 6000 koku hatamoto post within the Tokugawa shogunate for his services in the Battle of Osaka. His son, Matsudaira Noritsugu, increased to 16,000 koku, and was thus promoted to the ranks of the fudai daimyō in 1684.
In 1713, Matsudaira Norizane moved the seat of the domain from mountainous Ogyū (in what is now the northern portion of the city of Toyota to the more conveniently located Okutono location (in what is now part of the city of Okazaki. However, the domain suffered greatly due to inclement weather and flooding of the Yasaku River during the Kyōhō period, which led to crop failure and famine. The problems were repeated during the Great Tenpō Famine of 1832–36, although the domain was able to escape the more severe effects of the famine due to reforms implemented by its lord, Matsudaira Noritoshi.
In the Bakumatsu period, the domain achieved prominence thanks to its last daimyō, Matsudaira Norikata, who served as a senior councilor in the final years of the Tokugawa shogunate. Another contemporary figure born in Okutono was Nagai Naoyuki. During Norikata's tenure, the domain seat was moved from Mikawa Province to the Tanokuchi district of Shinano Province (though the holdings remained unchanged), and with the construction of Tatsuoka Castle, the domain also became known as Tatsuoka Domain. The domain was dissolved by the Meiji restoration in 1871 with the abolition of the han system.
Holdings at the end of the Edo period
As with most domains in the han system, Okutono Domain consisted of several discontinuous territories calculated to provide the assigned kokudaka, based on periodic cadastral surveys and projected agricultural yields.
- Mikawa Province
- 28 villages in Kamo District
- 7 villages in Nukata District
- Shinano Province
- 24 villages in Saku District
List of daimyō
- As Ogyū Domain (奥殿藩 Ogyū-han)
# Name Tenure Courtesy title Court Rank kokudaka Lineage 1 Matsudaira Noritsugu (松平乗次) 1684–1687 Nuidono-no-kami (縫殿頭) Lower 5th (従五位下) 16,000 koku son of hatamoto Matsudaira Naotsugu 2 Matsudaira Norinari (松平乗成) 1687–1703 Nuidono-no-kami (縫殿頭) Lower 5th (従五位下) 16,000 koku son of Noritsugu 3 Matsudaira Norizane (松平乗真) 1703–1711 Nuidono-no-kami (縫殿頭) Lower 5th (従五位下) 16,000 koku son of hatamoto Honda Masatane
- As Okutono Domain (奥殿藩 Okutono-han)
# Name Tenure Courtesy title Court Rank kokudaka Lineage 3 Matsudaira Norizane ( 松平乗真) 1711–1716 Nuidono-no-kami (縫殿頭) Lower 5th (従五位下) 16,000 koku transfer from Ogyū 4 Matsudaira Mitsunori (松平盈乗) 1716–1742 Nuidono-no-kami (縫殿頭) Lower 5th (従五位下) 16,000 koku son of Norizane 5 Matsudaira Noriyasu (松平乗穏) 1742–1782 Iwami-no-kami (石見守) Lower 5th (従五位下) 16,000 koku son of Mitsunori 6 Matsudaira Noritomo (松平乗友) 1782–1790 Hyōbu-no-shō (兵部少輔) Lower 5th (従五位下) 16,000 koku 2nd son of Noriyasu 7 Matsudaira Noritada (松平乗尹) 1790–1802 Mondo-no-kami (主水正) Lower 5th (従五位下) 16,000 koku 4th son of Noriyasu 8 Matsudaira Noriyoshi (松平乗羨) 1802–1827 Nuidono-no-kami(縫殿頭) Lower 5th (従五位下) 16,000 koku 2nd son of Noritomo 9 Matsudaira Noritoshi (松平乗利) 1827–1852 Iwami-no-kami(石見守) Lower 5th (従五位下) 16,000 koku son of Noriyoshi 10 Matsudaira Norikata (松平乗謨) 1852–1863 Nuidono-no-kami (縫殿頭) Lower 5th (従五位下) 16,000 koku 2nd son of Noritoshi
- As Tanokuchi Domain (田野口藩 Tanokuchi-han)
# Name Tenure Courtesy title Court Rank kokudaka Lineage 10 Matsudaira Norikata (松平乗謨) 1863–1871 Nuidono-no-kami (縫殿頭) Lower 5th (従五位下) 16,000 koku transfer from Okutono
- Papinot, E (1910). Historical and Geographic Dictionary of Japan. Tuttle (reprint) 1972.
- "Okutono" at Edo 300 (in Japanese)
- Papinot, Jacques Edmond Joseph. (1906). Dictionnaire d’histoire et de géographie du Japon; Papinot, (2003). "Matsudaira (Ōgyū)" at Nobiliare du Japon, pp. 30-32; retrieved 2013-7-9.
-  Okutono Domain (in Japanese)
- Mass, Jeffrey P. and William B. Hauser. (1987). The Bakufu in Japanese History, p. 150.
- Elison, George and Bardwell L. Smith (1987). Warlords, Artists, & Commoners: Japan in the Sixteenth Century, p. 18.