Avicenna, also known as Ibn Sina, was a Persian polymath who lived from 980 to 1037 CE. He is best known for his contributions to philosophy and medicine, particularly his influential work, The Canon of Medicine, which served as a standard medical text in Europe and the Islamic world for centuries. Avicenna's ideas helped bridge ancient Greek philosophy and modern science. In addition to medicine, Avicenna made significant contributions to various fields, including mathematics, astronomy, and chemistry. His philosophical writings explored topics such as metaphysics and ethics, influencing later thinkers like Thomas Aquinas and Rene Descartes. Avicenna's legacy continues to impact both science and philosophy today.