He is called by many names in both the Old and New Testaments, as well as throughout both Judaism and Christian traditions. He is sometimes seen as a snake, a dragon, an angel of light, a terrible demon, or a single sinful thought. Who is the one called Satan or Devil, and what do the scriptures and other ancient texts tell us about him? What have great religious thinkers and theologians written about him and his armies of demonic followers? What beliefs with reference to the devil have survived in major religions today? What influence has Satan had on Literature and popular culture throughout man's history?