Simon Magus (Greek Σίμων ὁ μάγος, Latin: Simon Magus), also known as Simon the Sorcerer or Simon the Magician, was a religious figure whose confrontation with Peter is recorded in Acts. The act of simony, or paying for position, is named after Simon, who tried to buy his way into the power of the Apostles.
According to Acts, Simon was a Samaritan magus or religious figure of the 1st century AD and a convert to Christianity, baptised by Philip the Evangelist. Simon later clashed with Peter. Accounts of Simon by writers of the second century exist, but are not considered verifiable. Surviving traditions about Simon appear in orthodox texts, such as those of Irenaeus, Justin Martyr, Hippolytus, and Epiphanius, where he is often described as the founder of Gnosticism, which has been accepted by some modern scholars, while others reject claims that he was a Gnostic, maintaining that he was merely considered to be one by the Church Fathers.
Justin, who was himself a 2nd-century native of Samaria, wrote that nearly all the Samaritans in his time were adherents of a certain Simon of Gitta, a village not far from Flavia Neapolis. Irenaeus believed him to have been the founder of the sect of the Simonians. Hippolytus quotes from a work he attributes to Simon or his followers the Simonians, Apophasis Megale, or Great Declaration. According to the early church heresiologists, Simon is also supposed to have written several lost treatises, two of which bear the titles The Four Quarters of the World and The Sermons of the Refuter.
In apocryphal works including the Acts of Peter, Pseudo-Clementines, and the Epistle of the Apostles, Simon also appears as a formidable sorcerer with the ability to levitate and fly at will. He is sometimes referred to as "the Bad Samaritan" due to his malevolent character. The Apostolic Constitutions also accuses him of "lawlessness" (antinomianism).
The canonical Acts of the Apostles features a short narrative about Simon Magus; this is his only appearance in the New Testament.