The year of establishment and author of each.
Manyoshu: Compiled by Otomo Yakamochi and others around 780
Kokin Wakashu: 905, compiled by Kinotsurayuki and others
The Tale of Genji: Around 1008, Murasaki Shikibu
Meigetsuki: 1180, Fujiwara Teika
New Kokin Wakashu: 1210, compiled by Fujiwara Teika and others
Hojoki: 1212, KamonoChomei
It is a national asset of Japan.