Ibn Sina (980-1037 CE), commonly known in the West as Avicenna, was a Persian[4] polymath who is regarded as one of the most significant physicians, astronomers, philosophers, and writers of the Islamic Golden Age,[5] and the father of early modern medicine.[6][7][8]. ..Of the 450 works he is believed to have written, around 240 have survived, including 150 on philosophy and 40 on medicine.[10] His most famous works are The Book of Healing, a philosophical and scientific encyclopedia, and The Canon of Medicine, a medical encyclopedia[11][12][13] which became a standard medical text at many medieval universities[14] and remained in use as late as 1650.[15] Besides philosophy and medicine, Avicenna's corpus includes writings on astronomy, alchemy, geography and geology, psychology, Islamic theology, logic, mathematics, physics, and works of poetry.[16]