Tokugawa Ieharu
was the 4th "daimyō" of Sabae Domain and 5th hereditary chieftain of the Manabe clan. His courtesy title was "Shimōsa-no-kami", and his Court rank was Junior Fifth Rank, Lower Grade. He was the third son of Manabe Akimichi and was posthumously adopted on Manabe Akinaka's death without heir in 1771. He was received in formal audience by Shōgun Tokugawa Ieharu in 1772 and visited Sabae in 1773. Although he took personal interest in attempts to reform the domain, the Great Tenmei famine resulted in 7597 deaths, and he depleted the clan's resources in an effort to help the surviving populace. He died in 1786 at the age of 47. His wife was a daughter of Hotta Masasuke of Sakura Domain.