Lu Yu (Chinese: 陆羽; pinyin: Lù Yǔ) (733–804) is respected as the Sage of Tea for his contribution to Chinese tea culture. He is best known for his monumental book The Classic of Tea (Chinese: 茶经; pinyin: chájīng), the first definitive work on cultivating, making and drinking tea.
The original version of The Classic of Tea consisted of 3 books covering 10 chapters in total; book 1 consisted of the first 3 chapters, book 2 consisted of chapter 4 only, book 3 consisted of chapters 5 to 10. After the Tang Dynasty all three books were bound into a single one and the three volumes version was no longer available.
A more extensive biography can be found at Wikipedia