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==