Sugawara no Takasue no musume (1008-approx. 1059), or Takasue\u2019s daughter, was the author of \u201cSarashina Nikki,\u201d or \u201cSarashina Diary,\u201d a well-known book providing an in-depth look at life during Japan\u2019s Heian period. While the book remains prolific and relevant even today, we don\u2019t know the author's name.