醍醐天皇
Tsurayuki was a son of Ki no Mochiyuki. In the 890s he became a poet of "waka", short poems composed in Japanese. In 905, under the order of Emperor Daigo, he was one of four poets selected to compile the "Kokin Wakashū", the first imperially-sponsored anthology ("chokusen-shū") of "waka" poetry.