 In 1600, Iwaki Sadataka opposed Tokugawa Ieyasu during the Battle of Sekigahara and as a result, the Iwaki clan was deposed.Torii Tadamasa was appointed as "daimyō" of Iwakitaira Domain under the Edo period Tokugawa shogunate, with an assessed "kokudaka" of 100,000 "koku" and constructed Iwakitaira Castle.The domain covered only a portion of what is now Iwaki city