The great doctor, scholar and philosopher of the eastern world during the middle Ages. For years, his works were used as text books at western universities. He was a true pathfinder not only in medicine but also in mathematics and physics. The philosophical encyclopedia called "Sifa" (Healing), "Kanun" which is a medical encyclopedia, and books titled "Necat" and "Isarat" and the twenty volume "Kitab-ül- insaf" which comments on total works of Aristotle are among his major works.