Kanshi (??) is a Japanese term for Chinese poetry in general as well as the Japanese poetry written in Chinese by Japanese poets. It literally means "Han poetry". Kanshi was the most popular form of poetry during the early Heian period in Japan among Japanese aristocrats and proliferated until the modern period.
The earliest collection of kanshi was the Kaif?s?, compiled in 751. The Kaif?s? was also one of the earliest works of Japanese literature, and according to Judith Rabinovitch and Timothy Bradstock, it was a collection of occasional verse spanning from 672-751. The compiler of the Kaif?s? may have been Omi no Mifune, Isonokami no Yakatsugu, or Prince Shirakabe and Fujiwara no Satsuo. Three imperial collections of kanshi were compiled during the 9th century: the Ry?unsh? of 814, the Bunka Sh?reish? of 818, and the Keikokush? of 827. Indeed, kanshi was accorded a higher place than the native waka form until the Kokin Wakash? collection was published in 905. Even before the early Heian period, the word shi (?) meaning "poetry" was automatically understood to refer to kanshi, while the character ? (ka/uta) of waka ?? referred to Japanese poetry proper.
The Shi Jing, great Chinese poets of the Six Dynasties and Tang dynasty, such as Bai Juyi and others influenced the Japanese kanshi poets of the time, and when the Japanese met foreign diplomats of the time, they communicated in Chinese writing. Some went to China for study or diplomatic relations, and learned under Chinese poets such as Li Bai and Du Fu. Important kanshi poets of the Heian period included K?kai, who learned to speak Chinese fluently during his time studying in China, Sugawara no Michizane, who did not study in China, but had a good understanding of Chinese, and Shimada no Tadaomi, among many others. Emperor Saga was a notable kanshi poet, who even ordered the compilation of 3 anthologies of kanshi, the first three imperial anthologies. Also noteworthy are private collections of Chinese poetry. One such collection combined both kanshi and waka: cf. the Wakan r?eish?.
Kanshi composition is not limited to Medieval Japan. During the Edo period and the early Meiji period many bunjin (??) or 'men of letters' schooled in the philosophy of Neo-Confucianism composed kanshi. Despite the fascination of the Japanese with the European literature in the early 20th century, many of the "new literary giants" of the time, (e.g. Natsume S?seki) composed kanshi. Gen. Maresuke Nogi was a noted poet of kanshi poems. During World War II, Japanese militarist propaganda encouraged study and composition of kanshi because it was considered to boost the "martial spirit". After 1945, study of kanshi steadily declined as the school system was changed by the American Occupation policies. Nowadays, kanshi is usually studied in the upper-level kanbun classes in high schools, albeit only in passing. Shigin hobbyists maintain the chanting tradition, but they are few and far between.
Kanshi had multiple forms, but most notable were in 5 or 7 syllables in 4 or 8 lines. The Japanese poets of kanshi were skilled in the strict rhyming rules of lüshi ?? and jueju ??, the two forms of the regulated verse that had gained most popularity during the Tang dynasty in China.