In 905, due to an imperial order from the Emperor Daigo, the "Kokin wakashu" (Collection of Ancient and Modern Poems), which was the first of the Chokusen wakashu (anthologies of Japanese poetry compiled by Imperial command), was compiled and presented to the emperor by four people: KI no Tsurayuki, KI no Tomonori, OSHIKOCHI no Mitsune and MIBU no Tadamine.
延喜5年（905年）醍醐天皇の勅命で、紀貫之・紀友則・凡河内躬恒・壬生忠岑の4人により、最初の勅撰和歌集『古今和歌集』が撰進された。