Kokin Wakashu: Japan's first chokusen wakashu (anthology of Japanese poetry compiled by Imperial command) in 905 which was ordered by the Emperor Daigo and compiled by KI no Tsurayuki, KI no Tomonori, OSHIKOCHI no Mitsune, MIBU no Tadamine, etc.
古今和歌集：延喜5年（905年）に醍醐天皇が紀貫之、紀友則、凡河内躬恒、壬生忠岑等に編纂を命じて出来た最初の勅撰和歌集。