 Ibn Rushd remained productive for at least four decades. He was the author of a large corpus that extends over medicine, logic and philosophy in all its branches, including natural philosophy, astronomy, metaphysics, psychology, politics, and ethics. His work also includes the sciences of Islamic religion: jurisprudence (fiqh), the foundations of Islamic law (usūl al-fiqh), the foundations of religion (usūl al-dīn), and the science of the Arabic language, including grammar. With important exceptions, most of his works are available in the original Arabic. For those works that have been lost, while readers await the day of their rediscovery, they must generally make do with medieval translations in Hebrew or Latin.