Van wie was Yanagihara Naruko?

Yanagiwara Naruko (Japanese: 柳原愛子), also known as Sawarabi no Tsubone (26 June 1855 – 16 October 1943), was a Japanese lady-in-waiting of the Imperial House of Japan. A concubine of Emperor Meiji, she was the mother of Emperor Taishō and the last concubine of Japan and the last concubine to ever give birth to a reigning Emperor of Japan.