Since its inception, Islam and its civilization have been in continuous relationships with other religions, cultures, and civilizations, including not only different forms of Christianity and Judaism inside and outside the Middle East, Zoroastrianism and Manicheism, Hinduism and even Buddhism, but also tribal religions in West and East Africa, in South Russia and in Central Asia, including Tibet. The essays collected here examine the many texts that have come down to us about these cultures and their religions, from Muslim theologians and jurists, travelers and historians, and men of letters and of culture.