Sunpu Castle
Lady Saigo would bear two sons by Ieyasu: Tokugawa Hidetada (1579–1632) and Matsudaira Tadayoshi (1580–1607). Hidetada would be the second "shōgun" of the new Tokugawa "bakufu", and led the nation from 1605 until his retirement in 1623. Lady Saigo died on July 1, 1589, at Sunpu Castle, aged 37 years. The cause of her early death was never determined. While murder was suspected at the time, and poison has been theorized as the mode, no culprit was ever identified.