This is the only sorcerer I am aware of in the New Testament. The artwork tells the tale of he and Peter essentially in a contest of faith in Rome. Magus was in league with various demons who gave him all kinds of powers. In Rome they gave him the power to levitate. Peter saw this and begged God to intervene and stop this mocking of the ascension of Christ. God obliged and caused the demons to become visible while the air beneath their wings was removed (vacuum?) and the fell back to earth with Magus suffering three breaks to his right leg.
The bas relief here is meant to portray the sorcerer realizing that the demons lied and were not giving him divinity at all. Just answering his whims so he'd think he had crossed over to divine status. The text at the bottom reads as "Misled by his magical art, Simon succumbs to his own weapons". He pleaded with Peter to bestow the same divine powers onto him, and that he'd pay him all the gold he could carry.
A curious part of this is the way his right hand is pointing down his leg. In the crease of his night shirt, above the ankle is a Tau cross, believed to be the actual shape of the cross Christ was killed on, along with many others.
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