At-all in another of his plays.   
One of this author's works features the first appearance of Don Juan in English literature, and one reworking of a Shakespeare play by this author gives the title character two mistresses, Melissa and Evandra.  In addition to The Libertine and The History of Timon of Athens, the Man-Hater, the misanthropes Emilia and Stanford are confronted by the arrogant dramatist Sir Positive At-all in another of his plays.   Yet another play features the merchants Bisket and Fribble and sees Mrs. Woodly sleep with the rakes Rains and Bevil, who pursue the honorable girls Lucia and Carolina.  This author of The Sullen Lovers and Epsom-Wells was depicted as waging "immortal war with wit" and "mature in dullness from his tender years" in a poem by one of his contemporaries.  FTP, name this English playwright attacked by John Dryden in his poem Mac Flecknoe.
One of this author's works features the first appearance of Don Juan in English literature, and one reworking of a Shakespeare play by this author gives the title character two mistresses, Melissa and Evandra.  
Thomas Shadwell