In the mirror universe, Morgen was a Daa'Vit prince who lived during the 24th century. In the 2340s, Morgen contacted Guinan and claimed that some of the Daa'Vit were unhappy being allied to the Klingons. However, this was a ruse designed to draw out the rebels and Morgen attempted to wipe them out. This led the being impersonating Guinan to kill Morgen and his associates. (STA - Mirror Universe short story: "The Traitor")