Al-Farabi: Being and the ontological structure of the universe

After an introduction pointing out the reception of Greek philosophy in the Arab and Islamic world after its expansion from Arabia in the Near East, with the assimilation of Aristotelian and Neoplatonic doctrines, this article aims to present the notion of being proposed by the philosopher Alfarabi (d. 950) as well as the ontological hierarchy of the universe, based on the idea of Necessary Being, First Being and First Cause, the source of all reality.