From their centre on the Arabian Peninsula, Muslims began their expansion during the early Postclassical Era. By 750 CE, they came to conquer most of the Near East, North Africa, and parts of Europe, ushering in an era of learning, science, and invention known as the Islamic Golden Age. The knowledge and skills of the ancient Near East, Greece, and Persia were preserved in the Postclassical Era by Muslims, who also added new and important innovations from outside, such as the manufacture of paper from China and decimal positional numbering from India.