It is commonly believed that Ryoken, who was renowned for fortune-telling, divined the future of Otama no kata (later Keishoin) who were to be a concubine of the third shogun Iemitsu TOKUGAWA and prophesied that she would give birth to the fifth shogun Tsunayoshi TOKUGAWA.
卜筮（ぼくぜい）の名声が高く、後に3代将軍徳川家光の側室となるお玉の方（後の桂昌院）を占って、5代将軍徳川綱吉を産むことを予言したという俗説がある。