Who wrote the play 'The Sad Shepherd' ?

The Sad Shepherd is an unfinished play by Ben Jonson.
- His Comedy Known as Comedy of Humours.

He wrote:
- Every Man in His Humour (1598), 
- Volpone, or The Fox (1606)
- The Alchemist (1610)
- Bartholomew Fair (1614) 

The Sad Shepherd is a poem by W.B Yeats.

Source: An ABC OF English Literature - Dr. M. Mofizar Rahman and Britannica