Abu Ali al-Husayn Ibn Abd Allah Ibn Sina, known as Abu Ali Sina (c.980 -1037) was a polymath of Persian origin and the foremost physician and philosopher of his time. He was also an astronomer, chemist, geologist, Hafiz, Islamic psychologist, Islamic scholar, Islamic theologian, logician, paleontologist, mathematician, Maktab teacher, physicist, poet, and scientist. Ibn Sina studied medicine under a physician named Koushyar. He wrote almost 450 treatises on a wide range of subjects, of which around 240 have survived. In particular, 150 of his surviving treatises concentrate on philosophy, and 40 of them concentrate on medicine. His most famous works are The Book of Healing, a vast philosophical and scientific encyclopedia, and The Canon of Medicine, which was a standard medical text at many medieval universities. The Canon of Medicine was used as a text-book in the universities of Montpellier and Lou vain as late as 1650.