Archimago is a sorcerer in Spenser's "Faerie Queene." His name means Arch-Image; he is continually engaged in deceitful magics, as when he makes a false Una to tempt the Red-Cross Knight into lust, and when this fails, conjures another image, of a squire, to deceive the knight into believing that Una was false to him.
Read more about Archimago: Interpretation, Archimago's Role in The Poem, Archimago Textualized