Human: I'd like to know the names of the most influential people in the history of medicine. Assistant: 
The first person I would recommend is Hippocrates, a Greek physician who lived from 460 BC to 370 BC. He is considered the father of Western medicine and is credited with developing the concept of the four humours theory which states that all human beings have a combination of four basic bodily fluids - blood, phlegm, yellow bile and black bile. He also developed the Hippocratic Oath, a set of principles for doctors to follow.