ISS Relentless

In the mirror universe, the ISS Relentless (NCC-1745) was a  heavy cruiser starship in the service of the Terran Empire's Imperial Starfleet in the early 2290s.

In 2293, the Relentless was part of the Terran reinforcements attacking the and its Romulan escorts near the Tholian border. ( mission "Sunstorm")