The volume discusses the post-New Testament Simon Magus from the era of the Church Fathers beginning with Justin Martyr to the early modern era represented in a seventeenth century Baroque relief in the Cathedral of Oviedo, Spain. Sources consulted are artistic, theological texts, historical chronicles, sermons, hagiographies, vernacular literatures, biblical commentaries, and heresiologies. Topics explored are: Traditions and Historiography; Types of Simon Magus in Anti-Gnostic sources; a comparison of the Acts of Peter and the Passions of the Holy Apostles Peter and Paul; Jerome and Vincent of Lerins on Simon Magus; the Nicolaitian heresy; the Fall of Simon Magus in the Church Fathers; Simon Magus, Dogs, and Simon Peter; Simon Magus in Irish and English medieval legends; Simon Magus, Nicolas of Antioch, and Muhammad; Vincent Ferrer and the canonical and apocryphal Simon Magus; Simon Magus in the Cathedral of Leon, Spain; Simon Magus in the Cathedral of Oviedo, Spain; and a full bibliographical inventory- 99 entries- of Simon Magus in artistic expression. The book is illustrated with about 28 artistic reproductions. The volume contains author and subject indexes and a full bibliography of works consulted.