Lu Yu
"The Classic of Tea" (《茶經》) by the Tang dynasty writer Lu Yu (陸羽)(729-804) is an early work on the subject. (See also Tea Classics) According to "Cha Jing" writing, around CE 760, tea drinking was widespread. The book describes how tea plants were grown, the leaves processed, and tea prepared as a beverage. It also describes how tea was evaluated. The book also discusses where the best tea leaves were produced.