Torii Tadamasa (鳥居 忠政, 1567 – October 2, 1628) was a Japanese feudal lord of the Azuchi-Momoyama and early Edo periods, who served Tokugawa Ieyasu and played a role in controlling the military in the eastern provinces.[1][2]
The second son of Ieyasu's chief vassal Torii Mototada,[3] when his father was killed in the Battle of Sekigahara, Tadamasa inherited Yahagi Domain in Shimōsa Province, worth 40,000 koku.[2] For distinguished service in the battle, he was awarded Iwakitaira Domain in Japan's Mutsu Province, worth 100,000 to 120,000 koku.[1][3]
In 1622, he was moved to the larger fief of Yamagata in Dewa Province, worth 220,000 koku.[1] In 1626, the first actual land survey of the region was carried out in Yamagata; the survey became widely known as the "Sakyo Rope".[1]