"Thaïs" takes place in Egypt under the rule of the Roman Empire, where a Cenobite monk, Athanaël, attempts to convert Thaïs, an Alexandrian courtesan and devotee of Venus, to Christianity, but discovers too late that his obsession with her is rooted in lust; while the courtesan's true purity of heart is revealed, so is the religious man's baser nature. The work is often described as bearing a sort of religious eroticism, and has had many controversial productions. Its famous Méditation, the "entr'acte" for violin and orchestra played between the scenes of act 2, is an oft-performed concert music piece; it has been arranged for many different instruments.