Lady Chaa (茶阿局, Chaa no Tsubone) (d. July 30, 1621) was a concubine of Tokugawa Ieyasu, the founder of the Tokugawa shogunate in Japan. She lived in Tōtōmi Province. Her Buddhist name was Unkoin.
She subsequently became a concubine of Ieyasu, and in 1592 bore him a son Matsudaira Tadateru. Chaa died in 1621. Her grave is at Sōkei-ji, a Buddhist temple in Bunkyō, Tokyo. Her buddhist name is Satoru'in
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