God, the soul and prophetic knowledge. Doctrines of the Arabic philosophers of the 9th–12th century who influenced medieval Scholasticism in Europe. The Arabic tradition combines Aristotelianism and Neoplatonism with other ideas introduced through Islam. Influential thinkers include the non-Arabs al-Farabi and Avicenna. The Arabic philosophic literature was translated into Hebrew and Latin, this contributed to the development of modern European philosophy. The Arabic tradition was developed by Moses Maimonides and Ibn Khaldun. Science Islamic science underwent considerable development during the 8th to 13th centuries CE, a source of knowledge that later spread throughout Europe and greatly influenced both medical practice and education. The language of recorded science was Arabic. Scientific treatises were composed by thinkers originating from across the Muslim world. These accomplishments occurred after Muhammad united the Arab tribes and the spread of Islam beyond the Arabian peninsula. Within a century after Muhammed's death (632 CE), an empire ruled by Arabs was established. It encompassed a large part of the planet, stretching from southern Europe to North Africa to Central Asia and on to India. In 711 CE, Arab Muslims invaded southern Spain; al-Andalus was a center of Arabic scientific accomplishment. Soon after, Sicily too joined the greater islamic world. Another center emerged in Baghdad from the Abbasids, who ruled part of the Islamic world during a historic period later characterized as the "Golden Age" (∼750 to 1258 CE). This era can be identified as the years between 692 and 945, and ended when the caliphate was marginalized by local Muslim rulers in Baghdad – its traditional seat of power. From 945 onward until the sacking of Baghdad by the Mongols in 1258, the Caliph continued on as a figurehead, with power devolving more to local amirs. The pious scholars of Islam, men and women collectively known as the ulama, were the most influential element of society in the fields of Sharia law, speculative thought and theology. Arabic scientific achievement is not as yet fully understood, but is very large. These achievements encompass a wide range of subject areas, especially mathematics, astronomy, and medicine. Other subjects of scientific inquiry included physics, alchemy and chemistry, cosmology, ophthalmology, geography and cartography, sociology, and psychology. Al-Battani (c. 858 – 929; born Harran, Bilad al-Sham) was an Arab astronomer, astrologer and mathematician of the Islamic Golden Age. His work is considered instrumental in the development of science and astronomy. One of Al-Battani's best-known