She was nobly born as Roku no Kimi (the sixth daughter) of the Udaijin (Minister of the Right), who had been in power during the reign of Emperor Kiritsubo, and was also Lady Kokiden's younger sister.
当時権勢を誇った桐壺帝の右大臣の六の君（六番目の娘）で、弘徽殿女御の妹という高貴な生まれ。