The Golden Age of Islam was a period from the 8th to 14th centuries where the Abbasid Caliphate became a center of learning, collecting knowledge from India, China, and ancient Greece while making significant contributions to mathematics, astronomy, philosophy, medicine, and geography. Caliphs built Baghdad as the hub of the Abbasid Caliphate, where scholars translated Greek texts and made scientific discoveries. This led to major advances in fields like algebra, geometry, trigonometry, and the establishment of the decimal number system. The Islamic Golden Age flourished until the Mongol invasion of Baghdad in 1258 which marked the end of this period of intellectual growth.