Which physician believed that mental illness was a result of imbalances in body fluids?

Name: Which physician believed that mental illness was a result of imbalances in body fluids?
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Galen, a physician from ancient Greece, believed in the doctrine of the four humours, which held that the body's health and personality depended on the balance of four bodily fluids or humours: blood, phlegm, yellow bile, and black bile. An imbalance in these humours was thought to cause mental illness.

Which Physician Believed That Mental Illness Was a Result of Imbalances