2737 B.C.

Tea, which acts as an antidote against the poisonous effects of some seventy herbs, is also said to be his discovery. Chinese legend places this discovery in 2737 B.C., according to which Shennong first tasted tea from tea leaves on burning tea twigs, which were carried up from the fire by the hot air, and landed in his cauldron of boiling water http://en.wikipedia.org/wiki/Shennong