Huang Di 黄帝, also known as Yellow Emperor, was born Gongsun Xuanyuan. He was known to have developed written characters with a well known scholar known as Changjie and the implementation of the characters leads to the growth of Chinese cultures and development. He was also very keen to improve the health of his people and together with his imperial court physician Qi Bao, he studied the art of healing and thus compiled the first edition of The Yellow Emperor's Medicine Classic. He  dedicated his life to the improvement and well being of his people thus by observing the stars, he created the calendar in which a year has 4 seasons i.e.. spring, summer, autumn and winter, which also serve as a guide to the timing of planting, when and how to plough and to harvest the crops to achieve bumper harvest. Agriculture and livestock improved and expanded under his administration and poverty and hardship was reduced to its minimum.  He also gave instruction to his wife, Leizu 荔 珠 to teach the people about silk weaving so that they could use it as fabric for clothing to keep warm during the cold month. He also taught his subject how to build houses and irrigation canals and how to control flood water. He encourages trading and business flourish as farmers benefited from bumper harvest and crops, life stocks such as pigs, fowls, ducks were used as barter trading,  while the women trades in silks and handcraft such as pottery and basket weaving. The mode of transaction were in gold, silver and paper-money issued by the emperor. During his reign, the people enjoyed peace and prosperity and he lived till an old age of 111. His tomb lies in Huangling County 黃 陵 in Shaanxi 山 西 province of China.