Shennong (神農), variously translated as "Divine Farmer" or "Divine Husbandman", born Jiang Shinian (姜石年), was a mythological Chinese ruler known as the first Yan Emperor who has become a deity in Chinese and Vietnamese folk religion. He is venerated as a culture hero in China and Vietnam. In Vietnamese, he is referred to as Thần Nông. Shennong has at times been counted amongst the Three Sovereigns (also known as "Three Kings" or "Three Patrons"), a group of ancient deities or deified kings of prehistoric China. Shennong has been thought to have taught the ancient Chinese not only their practices of agriculture, but also the use of herbal drugs. Shennong was credited with various inventions: these include the hoe, plow (both leisi (耒耜) style and the plowshare), axe, digging wells, agricultural irrigation, preserving stored seeds by using boiled horse urine, trade, commerce, money, the weekly farmers market, the Chinese calendar (especially the division into the 24 jieqi or solar terms), and to have refined the therapeutic understanding of taking pulse measurements, acupuncture, and moxibustion, and to have instituted the harvest thanksgiving ceremony (zhaji(蜡祭) sacrificial rite, later known as the laji(腊祭) rite). "Shennong" can also be taken to refer to his people, the Shennong-shi (). In Chinese mythology, Shennong taught humans the use of the plow, aspects of basic agriculture, and the use of medicinal plants. Possibly influenced by the Yan Emperor mythos or the use of slash-and-burn agriculture, Shennong was a god of burning wind. He was also sometimes said to be a progenitor to, or to have had as one of his ministers, Chiyou (and like him, was ox-headed, sharp-horned, bronze-foreheaded, and iron-skulled). Shennong is also thought to be the father of the Huang Emperor (黃帝) who carried on the secrets of medicine, immortality, and making gold. According to the eighth century AD historian Sima Zhen's commentary to the second century BC Shiji (or, Records of the Grand Historian), Shennong is a kinsman of the Yellow Emperor and is said to be an ancestor, or a patriarch, of the ancient forebears of the Chinese.