Tea was not created...
"Tea", can be basically described as an infusion herbs in boiling water, so the practice of extracting the "medicinal" components of herbs has been with mankind since before written record.
The beverage we have commonly come to call "tea" is the result of steeping the leaves of the tea tree (Camelia sinensis) in boiling water.
There is a written record by Lu Yu, from 780 AD, the Ch'a Ching (Tea Classic). This however, is a scholarly work about the many teas favoured in China at the time, suggesting that tea had been an accepted beverage for unknown generations before that.
The T'ang Dynasty
As of September 2014 the Walmart store does not appear to carry the Dynasty oolong tea. However, the inventory can vary store to store.
Dynasty IT was created in 1999.
"The Chinese have consumed tea for thousands of years. People of the Han Dynasty used tea as medicine (though the first use of tea as a stimulant is unknown). China is considered to have the earliest records of tea consumption, with records dating back to the 10th century BC." (taken from the following wikipedia article: http://en.wikipedia.org/wiki/Tea#Origin_and_history)
Tang Dyasty for sure...
Hafsid dynasty was created in 1229.
Chalukya dynasty was created in 543.
Joseon Dynasty was created in 1392.
Trieu dynasty was created in 207.
Ngô Dynasty was created in 939.
Bahri dynasty was created in 1250.
Qianlong Dynasty was created in 2002.