紀貫之
In 905, with the imperial order to compile the Kokinshū, the first imperial anthology, "waka" poetry acquired a status comparable to "kanshi". "Waka" were composed at "uta-awase" and other official events, and the private collections of well-known poets such as Ki no Tsurayuki (the "Tsurayuki-shū") and Lady Ise (the "Ise-shū") became well-known.