Both of these elements are certainly present in Marlowe's Dr Faustus.
The element of peripeteia in a drama—or, indeed, any other literary work—represents a turning point for the character, or a moment at which the direction of the narrative changes because of a change in the character's belief system or personal direction. In Greek tradition, the peripeteia usually comes alongside, or just before, the anagnorisis, or revelation. It is for this reason that I'd argue that Faustus's peripeteia comes in Act V—"let Faustus live in hell a thousand years" if he could only be saved—rather than in Act II, in which Faustus has his first regrets about what he is doing ("Why waverest thou?").
In Act V, Faustus finally recognizes what hell really has in store for him, and the magnitude of what he has done, but it is now too late for him to turn back. This represents a moment of both understanding and of a sudden, desperate need to change his mind. So, this is both the anagnorisis and the...
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