Hippocrates was a Greek doctor who is called The Father of Medicine. Before he was born around 460 B.C., there was little science in medicine. Doctors thought the gods were to blame for illness. Hippocrates studied the human body and tried to figure out what caused disease so he could develop cures. Hippocrates suggested rules for doctors to follow. The Hippocratic Oath, which doctors still follow, was based on his teachings.