The beginnings of tea date back to about 5,000 years ago.
*5000 years ago in Japan is called the Jomon period.
It is first mentioned in a book written around 760,(Tang Dynasty: China).
→The world's first book on tea, Chakyo by Rikuu Kozen describes the tea of that time.
Its Tea Sutra states that the custom of tea ceremony (drinking tea) began
about 5,000 years ago with the legend of Shennong.
But, in fact, it was treated and passed down from the Chinese minorities to the Han Chinese as a medicine duning that time.
Here is a summary of what has been done so far.