What place do the four Gospels give Satan, demons, and Jesus' human opponents (including Jewish leaders but also Jesus' disciples) in their accounts of Jesus' life? This study takes a literary-historical approach to the Gospels, examining them as narratives. It shows how the authors were in the process of developing the devil as a character and determining which roles he filled. New interpretations of individual passages in the Gospels are given as well as new understandings of the theological emphases of each author. This study is also a contribution to redaction criticism and the relative chronology of the Gospels. It employs the theory of Matthean posteriority which revolutionizes our understanding of the literary relations between the Gospels and allows for a new understanding of theological development in early Christianity.