松平定信
was the 8th "daimyō" of Suwa and hereditary chieftain of the Suwa clan. Tadakata was the eldest son of Suwa Tadakata, and became "daimyō" on his father's retirement in 1816. He continued his father's policies, but also encouraged sericulture and increasing irrigation canals from Lake Suwa. However, his tenure was beset by disasters, including crop failures and the loss of the clan's Edo residence due to fire. In 1824, the domain had the only peasant uprising in its history. He retired in 1840 and died in 1851 at the age of 52. He was married to a daughter of Matsudaira Sadanobu of Shirakawa Domain.