下野国
was a "daimyō" during the Edo period of Japan. He was the sixth son of Tokugawa Ieyasu. He was born in Edo Castle during the year of the dragon ("tatsu"), and as a child his name was Tatsuchiyo (辰千代). His mother was , a concubine of Ieyasu. Ieyasu sent the boy to live with a vassal, Minagawa Hiroteru, "daimyō" of the Minagawa Domain in Shimotsuke Province.