Complexion  Complexion in humans is the natural color, texture, and appearance of the skin, especially on the face. The word "complexion" is derived from the Late Latin "complexi", which initially referred in general terms to a combination of things, and later in physiological terms, to the balance of humors. The four humours were four fluids that were thought to permeate the body and influence its health. The concept was developed by ancient Greek thinkers around 400 BC and developed further by Galen. People were thought to be either of the four temperaments: choleric, melancholic, phlegmatic, or sanguine. During the Middle Ages in Europe, the Latin term "complexio" served as the translated form of the Greek word "crasis", meaning temperament. The term “temperament” referred to the balance of the qualities of hot, wet, cold, and dry; each human body carried a different mixture of the elements. Thus, the Scythians, who lived in a cold climate, were considered colder and moister in complexion; the Aethiopians were hotter and drier. Complexion was defined as “that quality which results from the mutual interaction and interpassion of the four contrary primary qualities residing within the elements. These elements are so minutely intermingled as each to lie in very intimate relationship to one another. Their opposite powers alternately conquer and become conquered until a quality is reached which is uniform throughout the whole: this is the complexion.” As Matthew Simon writes, “Since it served as a fundamental concept, not only in physiology but also in pathology and therapy, complexion theory provided important support for the idea that medicine constituted a unified and rational body of knowledge.” By observation and judgment, medieval physicians determined the proper complexion of the individual when healthy. The body was healthy when all was in balance, but diagnosis was difficult, as there was no absolute measure of the right complexion, since this varied for individuals. Balance was thought to be restored by various remedies, which included bloodletting, scarifying, purging, and eating certain foods. Complexion was thought to be an indicator of one's character. The Spanish work known as "Corbacho", written by Alfonso Martínez de Toledo (c. 1398—c. 1470), includes a chapter called "De las complexiones." In it he describes the personalities of men of varying complexions: "There are others who are melancholic: these men correspond to the Earth, which is the fourth element, which is cold and dry.