John Dryden 
The Works of John Dryden, Volume XIV [PDF ebook] 
Plays; The Kind Keeper, The Spanish Fryar, The Duke of Guise, and The Vindication

Kept women, comic clerics, and political schemers enliven the four plays in this volume of the California Dryden. Dryden asserted that
The Kind Keeper was a moral play, dedicated to exposing the ’crying sin’ of keeping a mistress. The production was closed after three nights, but whether because of the play’s success in moralizing, or in exposing, is hard to know.