Galen developed a personality theory based around Hippocrates' original concept of four temperaments. Galen, expanded on Hippocrates' idea, claiming that both illnesses and personality variations could be explained by humor imbalances and that each individual had one of four temperaments.
The four temperaments can be categorized into four types which are:
The choleric person, for example, is passionate, ambitious, and daring while the melancholy person is reserved, nervous, and restricted. The sanguine person is joyous, eager, and hopeful and finally, the phlegmatic person is calm, dependable, and thoughtful.
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