Ben Jonson's play The Devil is an Ass is a Jacobean comedy first performed in 1616 by the King's Men and first published in 1631.
The play opens in Hell, with a junior demon called Pug persuading his master Satan to let him spend a day in London doing the Devil's work of tempting men to evil. Satan thinks Pug isn't up to the job; the world has grown so sophisticated in its vices, especially in the moral cesspool of London, that a simple devil like Pug will be severely out of his depth. Pug pleads his case, however, and Satan sends him into the world, specifically to plague an eccentric and foolish gentleman named Fabian Fitzdottrel. Taking over the body of a recently hanged thief, Pug persuades Fitzdottrel to take him on as a servant. The squire doesn't believe that Pug is a devil, despite Pug's insistence that he is, but is happy that he asks no wages. Meanwhile, Fitzdottrel is the target of various conmen, who befriend him hoping to take advantage of his eccentric foolishness and to seduce his beautiful young wife. Pug, in looking for opportunities for villainy, is beaten, manipulated, and generally abused, and ends up in Newgate Prison, from where he is rescued by Satan, triumphant in his prediction that London was more than Pug could handle. Fitzdottrel, discovering that Pug was a devil after all, abandons his new friends, exposing them as the conmen they really are.
This edition of the text, edited by Peter Happé and introduced by Simon Trussler, was published in 1995 by Nick Hern Books in its Drama Classics series.