William Shakespeare was a Human inhabitant of the mirror universe. Like his counterpart in the primary universe, he was a famous author of plays. His works were still read into the 22nd century by people throughout the Terran Empire. It was noted by the Denobulan Phlox, who was aboard the USS Defiant from the prime universe, that Shakespeare's works from both universes were similar. This was an exception among writers, as most were somewhat different from their counterparts. (ENT: "In a Mirror, Darkly, Part II")