Ibn Sina (Avicenna) (370-428 H) Abu `Ali Husain b. `Abdullah Ibn Sina, Balkhi, better known as Avicenna in the West, was the greatest of all medieval Muslim physicians. Also known as Al-Shaykh Al-Ra’as , and celebrated in the Western world as ‘the father of modern medicine,’ his is the most illustrious name in Arabic medical history after al-Razi. While Al-Razi was more of a physician than Ibn Sina, Ibn Sina was more of a philosopher. The author of 450 books on a variety of subjects including Philosophy and Medicine, Ibn Sina had a direct impact on the intellectual rebirth of Europe. George Sarton considers him to be the most famous scientist of Islam and one of the most famous of all races, places and times. He was one in the famed quartet of Mu`tazilite scholars, others being Al-Kindi, Al-Farabi and Ibn Rushd. Of the first three, it is said that the harmonization of Greek philosophy with Islam begun by al-Kindi, an Arab, was continued by al-Farabi, a Turk, and completed in t