It was said the year she was born was not known for a long time, however when the record of "Heihanki," (a comment written on the back of a scroll) was found during the 1980s, it became clear that she was born in 1149.
また長らく生年が不詳とされてきたが、1980年代に資料（『兵範記』裏書）の発見により久安5年の生まれであることが判明した。