Ki no Tsurayuki (c. 872 – 945), a famed poet and author, is credited with writing the first literary diary.
It covers classical Japanese literature from the Kojiki through the Tale of Genji and major waka poets like Fujiwara no Teika or Ki no Tsurayuki, through the Kamakura period and up to the beginnings of No plays and renga, in 1175 pages of text and endnotes (excluding the bibliography, index, and glossary).