c.400 BCE Greek physician Hippocrates says that the qualities of the four elements are reflected in body fluids.
c.325 BCE Greek philosopher Aristotle names four sources of happiness: sensual (hedone), material (propraietari), ethical (ethikos), and logical (dialogike).
1543 Anatomist Andreas Vesalius publishes On the Fabric of the Human Body in Italy. It illustrates Galen’s errors and he is accused of heresy.
1879 Wilhelm Wundt says that temperaments develop in different proportions along two axes: “changeability” and “emotionality.”
1947 In Dimensions of Personality, Hans Eysenck suggests personality is based ...