Method of Medicine, Volume IIIGalen of Pergamum (129? 199 216), physician to the court of the emperor Marcus Aurelius, was a philosopher, scientist, and medical historian, a theoretician and practitioner, who wrote forcefully and prolifically on an astonishing range of subjects and whose impact on later eras rivaled that of Aristotle. Galen synthesized the entirety of Greek medicine as a basis for his own doctrines and practice, which comprehensively embraced theory, practical