小田原藩
Ōkubo Tadayoshi was born as the eldest son of Ōkubo Noriyoshi, daimyō of Ogino-Yamanaka Domain, a cadet house of the Odawara Domain, at the domain's residence in Edo. The former daimyō of Odawara, Ōkubo Tadanori, was forced into retirement in 1868 due to his opposition to the Meiji Restoration, Tadayoshi became 12th head of the Odawara Ōkubo clan and by default, the 10th daimyō of Odawara Domain. However, the Meiji government reduced his revenues from 113,000 "koku" to 75,000 "koku", given the Ōkubo clan's lack of support to the imperial cause during the Boshin War.