Lady Saigō (西郷の局 or 西郷局 Saigō-no-Tsubone?) (1552 – 1 July 1589), also known as Oai, was the first consort and trusted confidante of Tokugawa Ieyasu, the samurai lord who unified Japan at the end of the sixteenth century and then ruled as Shogun. She was also the mother of the second Tokugawa shogun, Tokugawa Hidetada.
