Born in Pergamum in Asia Minor about 129 and died in 216, he is a Greek physician of antiquity who practiced medicine in Pergamum and Rome, where he healed several emperors.
A prolific and brilliant author, he remains an exceptional figure in history because of the alliance of a great speculative power and a passionate investigation of medical realities. Based on both the reason (logos) and the experience (would start) he calls the two legs, he tried everything in his life, to build a global explanatory system that brings together all parts of medical art
He is considered the last of the great creative doctors of Greco-Roman antiquity and with Hippocrates, one of the main founders of the basic principles on which European medicine is based.
He gave priority to anatomical observation and tried to establish hypotheses about physiological processes by conducting experiments on the animal.