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The Roman philosopher and physician Claudius Galen formulated a concept of personality types based on the ancient Greek theory of humorism, which attempted to explain the workings of the human body. The roots of humorism go back to Empedocles, a Greek philosopher who suggested that different qualities of the four basic elements—earth (cold and dry), air (warm and wet), fire (warm and dry), and water (cold and wet)—could explain the existence of all known substances. Hippocrates , the “Father of