In 1929, Tamai Kosuke identified the person behind Sanuki Tenji as Nagako from the Fujiwara family.
[2] Nagako served for eight years as the second-ranked female servant in the Horikawa court, who was likely her age.
Her older sister had been Horikawa's wet nurse and had entered a monastery while grieving his death in 1107.
In 1119, she was pushed away from Toba: It was reported that she became maniacal, developed delusions of seeing Horikawa, and uttered prophecies.
The second volume includes 23 poems, several of them citations of other poets, but most of them prove Nagako's aptitude in poetry.
The second volume stops abruptly at the beginning of 1109; a different author wrote the closing lines.