Tea Spreading in the Tang Dynasty

In the fifteenth year of Tang Zhenguan (A.D 641), tea was introduced into Tibet as the dowry of Princess Wencheng.
   
Tea had become a staple of border trade commodities in the Tang Dynasty. The new Tang's book "Lu Yu's Biography" recorded that Huihe people traded horses for tea in the morning. This was the beginning of tea-horse trade, which lasted for more than one thousand years through the Tang, Song, Yuan, Ming and Qing dynasties. Tea was then introduced into the Northwest, Southwest, Mongolia and Tibet.