The history of tea in China is long and complex, for the Chinese have enjoyed tea for millennia. Scholars hailed the brew as a cure for a variety of ailments; the nobility considered the consumption of good tea as a mark of their status, and the common people simply enjoyed its flavour. In 2016, the discovery of the earliest known physical evidence of tea from the mausoleum of Emperor Jing of Han (d. 141 BCE) in Xi'an was announced, indicating that tea from the genus Camellia was drunk by Han dynasty emperors as early as the 2nd century BCE. Tea then became a popular drink in the Tang (618–907) and Song (960–1279) dynasties. Historical background According to legend, tea was first discovered by the legendary Chinese emperor and herbalist, Shennong, in 2737 BCE. It is said that the emperor liked his drinking water boiled before he drank it so it would be clean, so that is what his servants did. One day, on a trip to a distant region, he and his army stopped to rest. A servant began boiling water for him to drink, and a dead leaf from the wild tea bush fell into the water. It turned a brownish color, but it was unnoticed and presented to the emperor anyway. The emperor drank it and found it very refreshing, and cha (tea) came into being. The Erya, a Chinese dictionary dated to the 3rd century BCE, records that an infusion of some kind of leaf was used as early as the Zhou dynasty (1046–256 BCE). While historically the origin of tea as a medicinal herb useful for staying awake is unclear, China is considered to have the earliest records of tea drinking, with recorded tea use in its history dating back to the first millennium BCE. The Han dynasty (206 BCE–220 CE) used tea as medicine. The use of tea as a beverage drunk for pleasure on social occasions dates from the Tang dynasty (618–907 CE) or earlier. 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