Jōjin

was a Japanese Tendai monk who documented his journey to the Chinese Buddhist centres of Mount Tiantai and Mount Wutai in 1072–1073 in .

Jōjin's home monastery was Enryaku-ji on Mount Hiei. He sent a cache of printed texts back to Japan in 1073 covering translations made since mission in 984.

The poem attracted little attention until 1942, when the newspapers that evolved into the present Mainichi Shimbun published , literally meaning something like, "One Hundred Patriotic Poems by One Hundred Poets." The title refers to the familiar Hyakunin Isshu, a medieval anthology of one hundred poems, each by a different poet. Because the poems came to be used in a card game played in Japanese homes every New Year, they are among the best known in the classical Japanese poetic canon.