Throughout human history, people have tried to classify each other by describing personality types. The ancient Greeks described the four humors, a theory that personality results from a mixture of ...

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Galen, a Greek physician, is born. He develops the theory of the four "humors": blood, phlegm, yellow bile and black bile. Good health is thought to result from a balance of the humors ...

The word has evolved from the Ancient Greek physician Hippocrates’s theory of the Four Humors. He believed that the mood of a person was governed by the balance of four different fluids in the ...

Hippocrates had developed an idea known as the four humours, which Galen believed in too. The idea was that our body’s health was largely based on the balance of four substances called the humours.