  Abu Yusuf Ya‘qub ibn Ishaq Al-Kindi (ca. 800–870 CE) was the first self-identified philosopher in the Arabic tradition. He worked with a group of translators who rendered works of Aristotle, the Neoplatonists, and Greek mathematicians and scientists into Arabic.  Al-Kindi’s own treatises, many of them epistles addressed to members of the caliphal family, depended heavily on these translations, which included the famous Theology of Aristotle and Book of Causes, Arabic versions of works by Plotinus and Proclus.  Al-Kindi’s own thought was suffused with Neoplatonism, though his main authority in philosophical matters was Aristotle. Al-Kindi’s philosophical treatises include On First Philosophy, in which he argues that the world is not eternal and that God is a simple One.  He also wrote numerous works on other philosophical topics, especially psychology (including the well-known On the Intellect) and cosmology. Al-Kindi’s work in mathematics and the sciences was also extensive, and he was known in both the later Arabic and the Latin traditions for his writings on astrology.