How to Be HealthyThe second century Greek physician Galen, the most famous doctor in antiquity after Hippocrates, is a central figure in Western medicine. A talented doctor, surgeon, writer, philosopher, teacher, pharmacologist, and inventor, Galen attended the court of Marcus Aurelius, living through outbreaks of plague (likely smallpox) that devastated the Roman Empire. He also served as a physician for professional gladiators, boasting that only two fighters died