Tokugawa Ieharu
was the 5th "daimyō" of Sabae Domain and 6th hereditary chieftain of the Manabe clan. His courtesy title was "Shuzen-no-kami", later "Wakasa-no-kami", and his Court rank was Junior Fifth Rank, Lower Grade. He was the eldest son of Manabe Akitoa by a concubine. In 1785 he was received in formal audience by Shōgun Tokugawa Ieharu. He became "daimyō" on his father's death in 1786. He passed numerous laws on fiscal restraint in an attempt to improve the domain's finances to little avail, and turned to Confucianism, inviting noted scholars from Kyoto and establishing a han school and commissioning a history of the domain. He died of illness at the age of 42 in 1812.