Tokugawa Ieharu
was the 9th Hori "daimyō" of Suzaka. Naosato was the seventh son of Tachibana Nagahiro of Miike Domain and his mother was a daughter of Hori Naohide. He was adopted as posthumous heir to the childless Naosato on the latter's death in 1784 and was presented in formal audience to Shōgun Tokugawa Ieharu the same year. In 1789 he was appointed "Osaka kaban", and in 1792 he was appointed "Ōbangashira" and castellan of Nijō Castle. He resigned his offices in 1803 citing illness; however, in 1804 he was appointed a "Sōshaban". He resigned this post in 1809, again citing illness. He established a han school in the domain around 1804. He retired from his offices in 1813 and died the following year. His wife was a daughter of Hosokawa Okiharu of Yatabe Domain.