Li Shangyin (simplified Chinese: 李商隐; traditional Chinese: 李商隱, c. 813 – 858), courtesy name Yishan (義山), was a Chinese poet of the late Tang Dynasty, born in Henei (now Qinyang, Henan). Along with Li He, he was much admired and "rediscovered" in the 20th century by the young Chinese writers for the imagist quality of his poems. He is particularly famous for his tantalizing "no title" (無題) poems.
Li was a typical Late Tang poet: his works are sensuous, dense and allusive. The latter quality makes adequate translation extremely difficult. The political, biographical or philosophical implications supposed to be contained in some of his poems have been a subject of debate for many centuries in China.
More Detail: http://en.wikipedia.org/wiki/Li_Shangyin