According to 'Toribeno', a series of "Eiga Monogatari (the Tale of Glory)", Teishi who had a premonition that she would die asked her to raise her nephew, Imperial Prince Atsuyasu and upon death of Teishi in Jsanuary 1001, carried out judai (an Imperial Consort's bridal entry into court) to serve as a substitute mother for her three bereaved children.
『栄花物語』「鳥辺野」の巻によれば、死を予感した定子より甥の敦康親王の養育を託され、長保2年（1000年）12月に定子が亡くなったのち、3人の遺児の母代として入内した。