In China, soy has been considered one of the five most sacred types of grain for some 5,000 years, essential to Chinese culture (together with rice, wheat, barley and millet). It was actually deemed essential by the legendary Caesar Shennong, the divine farmer, considered to be the father of Chinese agriculture. Its origins are in North China, from a wild plant named Glycine Ussuriensis.
The process of soy domestication, probably one of the first crops to be cultivated by man, began around the 11th century BC, both as food and for medicinal purposes. By the first century, soy arrived to South and Central China and to Korea. By the 7thcentury, it could be found in Japan, Indonesia, the Philippines, Vietnam, Thailand, Malaysia, Burma, Nepal and North India. It took till the 18th century to arrive in the West.