Tokugawa Ietsuna
was the 4th "daimyō" of Suwa and hereditary chieftain of the Suwa clan. Tadatora was the third son of Suwa Tadaharu and was noted for his scholarship at an early age. Shōgun Tokugawa Ietsuna personally acted as his tutor. He became "daimyō" on the death of his father in 1695. However, his tenure was marred by the destruction of the clan's Edo residence in the 1703 Genroku earthquake, the rebuilding of which plunged they domain into debt. He died in 1731 at the age of 69. He was married to a daughter of Matsudaira Masakatsu of the short-lived Matsuoka Domain in Echigo.