The Yellow Emperor, a legendary ruler and folk hero who is considered the common ancestor of the Chinese people; traditional dates for his reign are approximately 2697 to 2597 BC.

eighty; 80

one; the number 1; single; alone

An influential ancient Chinese medical text from around the 1st century AD, written in a Q&A format to explain difficult points in the 黄帝内经 huáng​dì​nèi​jīng.