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Galen (born 129 ce, Pergamum, Mysia, Anatolia [now Bergama, Turkey]—died c. 216) was a Greek physician, writer, and philosopher who exercised a dominant influence on medical theory and practice in Europe from the Middle Ages until the mid-17th century. His authority in the Byzantine world and the Muslim Middle East was similarly long-lived. The son of a wealthy architect, Galen was educated as a philosopher and man of letters. His hometown, Pergamum, was the site...