As decided by fortune-telling, Imperial Princess Sonshi became Sai-in (Imperial Princess appointed to serve the deities of the Kamo-jinja Shrines) of her father, Emperor Reizei, when she was three years old, and later married her uncle, Emperor Enyu, after her father resigned as Emperor; however, she had her hair cut in secret and entered the priesthood in May 982.
尊子内親王は三歳で父帝冷泉天皇の斎院に卜定され、退下ののち叔父にあたる円融天皇に入内するが、天元(日本)5年（982年）四月、密かに髪を切り入道した。