  The theory of divine illumination is generally conceived of as distinctively Christian, distinctively medieval, and distinctively Augustinian. There is some justification for this, of course, inasmuch as Christian medieval philosophers gave the theory serious and sustained discussion, and inasmuch as Augustine gave illumination a very prominent role in his theory of knowledge. Still, it is better to think of the theory in a wider context. Divine illumination played a prominent part in ancient Greek philosophy, in the later Greek commentary tradition, in neo-Platonism, and in medieval Islamic philosophy. Moreover, it was Christian medieval philosophers, near the end of the thirteenth century, who were ultimately responsible for decisively refuting the theory. I will suggest that we view this last development as the first great turning point in the history of cognitive theory.