Kokiden no nyogo (the Empress Kokiden) --- a daughter of Tono Chujo (the first secretary's captain), and her mother was Shi no Kimi (the fourth daughter) of Udaijin (Minister of the Right) of the Emperor Kiritsubo.
弘徽殿女御…頭中将の娘、母は桐壺帝の右大臣の四の君。