In the mirror universe, the Tholian Assembly was the state government of the Tholian species of the Alpha Quadrant. It was run by the members of the Ruling Conclave of the Tholian Assembly. During the 23rd century, its territory was bordered by the Terran Empire and the Klingon Empire. In 2277, Reyes' efforts were thwarted by Emperor Spock's operative, T'Prynn, and the region fell under the control of the Tholians. However, war soon broke out with the Klingons over the region. (VAN - Mirror Universe short story: "The Black Flag"; TOS - Mirror Universe novel: The Sorrows of Empire)