Tea has some stories and for eternal life!?

I've just checked a couple of articles about the history of Japanese Green tea. It seems like coming from China in the beginning of 9th century by one Japanese monk who learned Buddhism there. His name is Saicho. He brought tea seeds. Still it's not sure where Japanese green tea came from. There are two places as candidates. One is Yunnan, south west China. And other is Assam, north east India. In those days, Green tea was for noble men. In China, the emperor brewed tea as medicine. As I wrote in this blog, once upon time green tea was used as medicine.
So why did emperors at ancient China look for medicine? Because they looked for ageless & eternal life. It means they are crazy to get medicine for that. One of such a medicine, it seemed to be a tea. Some time tea would help emperors hangover. Sometime help hangover for generals. Anyway when Saicho took it to Japan, Japanese general liked to brew Green tea because his hangover was removed. This was one of story which green tea was spread among Japanese warriors called Samurai. Monks grew tea plants in temple's garden. They used tea for medicine and meditation. Because it was believed to effect clearing mind, keeping concentration and protecting from falling asleep. So in ancient time, first tea had spiritual role much more than drinking.