 Possibly written by Thomas Kyd, the "Ur-Hamlet" would have been in performance by 1589, and was seemingly the first to include a ghost in the story.Shakespeare's company, the Chamberlain's Men, may have purchased that play and performed a version, which Shakespeare reworked, for some time.Since no copy of the "Ur-Hamlet" has survived, it is impossible to compare its language and style with the known works of any candidate for its authorship.