In the mirror universe, the Regent-class battlecruiser was a starship class used by the Klingon-Cardassian Alliance. The Regent-class was developed by the Klingon Empire and launched in the year 2372. Several ships of the class were in service to the Klingon Defense Force. (Mirror Universe - Shards and Shadows short story: "Family Matters") The Regent class is probably identical to the Qang-class with the exception of the name, being named Regent after the title of the Alliance's leader, rather than Chancellor.