AvicennaIbn Sina (980 1037), known as Avicenna in Latin, played a considerable role in the development of both Eastern and Western philosophy and science. His contributions to the fields of logic, natural science, psychology, metaphysics, theology, and even medicine were vast. His work was to have a significant impact on Thomas Aquinas, among others, who explicitly and frequently drew upon the ideas of his Muslim predecessor. Avicenna also affected the